The skin’s microbiome may play a key role

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New research finds that the skin’s microbiome and its bacterial pathways are involved in the skin aging process. fzant/Getty Images
  • A recent study published in the journal PLOS One has identified bacterial pathways associated with skin aging.
  • The data demonstrated that the main bacterial pathways related to aging involve the production of skin pigment, fatty acids, and ceramides.
  • Better understanding the molecular processes that drive skin aging and their relationship with the microbiome will require further research.
  • Data from prospective studies may help develop effective treatments to combat skin aging.

Bacteria, fungi, and viruses live on the skin and in the gut. The skin is the body’s largest organ, and it serves as a protective barrier from the outside environment.

Commensal microbial communities on the skin, also known as the skin microbiome, do not cause disease and benefit the body. They may be fixed or exist temporarily on the skin.

The skin microbiome interacts with the body’s immune system and may affect its functioning. And the immune system regulates the makeup of the skin microbiome.

Aging causes changes to the skin’s structure and function. This may result from “intrinsic” factors, such as hormonal, metabolic, or immune system changes. “Extrinsic” factors, such as smoking and exposure to sunlight and certain temperatures, may also trigger immune processes that affect the skin’s structure and rejuvenation.

Increased wrinkles, decreased elasticity, reduced wound healing, and impaired barrier function are skin changes that occur during aging.

Changes in the skin microbiome can also stem from a decline in the production of sebum, which is an oily substance that protects the skin, as well as from decreased water content in the skin and immune dysfunction.

Advanced scientific methods called 16S ribosomal RNA gene and metagenomic sequencing techniques are now available to assess changes in the skin’s microbes caused by aging.

Dr. Elizabeth Grice, an associate professor of dermatology and microbiology at the University of Pennsylvania, explained in a 2019 lecture that the 16S ribosomal RNA sequencing technique allows us to “answer the questions [about] the composition of a sample or the diversity of a sample.”

She went on to say that “Shotgun metagenomics provides a more nuanced view of the skin microbiome. Using these methods, one can take a sample containing the genomic DNA, […] break up that DNA in the sample, and then sequence those fragments. This allows one to identify microbes to the species and strain level, it allows one to reconstruct the genetic and functional metabolic pathways within a sample and, importantly, it gives you a multi-kingdom view of the skin microbiome.”

Previous studies have demonstrated that the skin microbiomes of all humans consistently contains certain species of Staphylococcus, Cutibacterium, Corynebacterium, and Acinetobacter bacteria.

However, age, body area, gender, and geographic location affect the composition of the skin microbiome. Although previous studies had identified changes in the makeup of the skin microbiome related to aging, researchers had yet to fully understand the mechanisms behind these changes.

In a new study, a team from NIZO Food Research, in the Netherlands, set out to understand the connection between the body’s cellular processes, called co-metabolism, and genes, or bacterial functionalities, involved in skin aging. Estée Lauder, a company that sells skincare products, partially funded the study.

First, the researchers searched existing scientific literature to identify common biologic pathways between humans and skin microbes linked to intrinsic skin aging. They then used 16S ribosomal RNA sequencing testing from cheek samples of female participants with various age-related skin changes to confirm the changes to the skin microbiome composition seen in selected studies.

The team took skin swab samples, one from each cheek, from 25 healthy female participants of European descent in Belgium. The participants fell into two age groups, one aged 20–28, and the other aged 59–68.

The study excluded participants with certain skin conditions and external factors related to skin aging. Some of the exclusion criteria included:

  • acne
  • eczema
  • psoriasis
  • use of skin medications, such as antibiotics, antifungals, or steroids, within 1 month of the study
  • smoking, or a history of smoking in the past 2 years
  • tanning or sunbathing
  • drinking more than 3 servings of alcohol per day

The researchers gathered reference genomes from the gene sequences database of the National Center for Biotechnology Information. The information concerned genes relevant to skin aging, as identified and confirmed by testing.

The team then used microbial pathways to create graphical models, which they used to analyze the reference skin organism genomes, 16S ribosomal RNA sequencing testing, and data from the direct analysis of genomes from the collected skin samples.

The group found that bacterial pathways linked to skin aging were related to the production of ceramides, which are lipids that compose the natural skin barrier, as well as fatty acids and pigmentation. The researchers also determined that bacterial enzymes involved in protein glycation were associated with skin aging.

Protein glycation in the skin occurs when sugars link to proteins, such as collagen and elastin. An accumulation of glycation of collagen and elastin end products can result in loss of skin elasticity and sagging.

Dr. Dina F. Bierman, a board-certified dermatologist at Providence Saint John’s Health Center, who was not involved in the study, explained to Medical News Today that:

“[The study] went one step beyond what we already knew. […] They separated the population based [on] how their skin had aged. […] Making that distinction is very important, in terms of understanding how the bacteria and their presence are influencing the skin and the metabolic processes that influence aging.”

One limitation of the study, however, is its small size and lack of diversity, which may limit the generalizability of its findings.

Overall, the results may serve as a basis for future studies seeking to improve our understanding of the interplay of molecular processes and the microbiome in skin aging.

Dr. Bierman described the study as a good starting point, but added that “A lot of research [is needed] before we can actually, for sure, say what the different bacteria are doing and how they interact with each [other], too, and might influence how our skin ages.”

Exposure to air pollutants may amplify risk for depression

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A new study looks at the impact of pollution on depression risk in people with a genetic susceptibility. Jelena Jojic Tomic/Stocksy
  • Exposure to air pollution is associated with cognitive deficits and an increased risk of depression.
  • A recent study examined how air pollutants impact brain networks to mediate changes in cognitive function and enhance the risk of depression.
  • The results suggest that genetic susceptibility to depression combined with high levels of exposure to air pollution have a disproportional effect on brain networks involved in cognition and stress.
  • Exposure to air pollutants was associated with activation of brain networks expressing depression-associated genes, suggesting that exposure to air pollution may cause adverse mental health effects by acting on the same brain networks related to genetic mechanisms of depression.
  • This suggests that individuals with a genetic susceptibility to depression may be more vulnerable to the adverse effects of air pollution on mental health.

Besides having a detrimental effect on physical health, prolonged exposure to air pollutants is also associated with adverse mental health effects.

Exposure to air pollutants, including fine particulate matter, may be associated with impaired cognitive functioning and depression.

Fine particulate matter, also known as PM2.5, consists of tiny inhalable particles smaller than 2.5 microns. These particles commonly come from industrial sources and vehicles.

How exposure to PM2.5 might increase the risk of depression is not well understood.

Also, scientists do not know whether air pollution can interact with a genetic predisposition for depression to increase the likelihood of depression.

Individuals with a genetic predisposition for a particular disease may have an increased likelihood of developing the condition in the presence of certain environmental factors or due to behaviors such as smoking.

A recent study investigated the effects of PM2.5 exposure, in combination with a genetic predisposition for depression, on brain networks involved in cognition and social stress.

The study’s lead author, Dr. Hao Yang Tan, a scientist at the Lieber Institute in Baltimore, MD, told Medical News Today:

“The study reveals for the first time how air pollution and genes interact with one another to impact important cognitive and emotional circuitry of the brain. Air pollution is changing the expression of genes that are conducive to depression.”

“Previous studies have observed air pollution’s link to depression, but our results are the first to show a direct, neurological cause,” he explained.

“What is most intriguing is that the two factors are linked in such a way that they have a multiplier effect on one’s risk of depression. That is, together, risk genes and bad air raise the risk of depression much more than either factor does in isolation.”

The study appears in the journal Proceedings of the National Academy of Sciences.

The study recruited 352 healthy participants residing in Beijing, China. Beijing has relatively high levels of air pollution, including high concentrations of PM2.5.

For each participant, the researchers studied several specific genetic variants that are associated with depression. From this information, they estimated their genetic susceptibility to depression.

To estimate the PM2.5 exposure levels for each individual, the researchers used air monitoring data obtained from the city air quality monitoring station closest to each person’s home for 6 months before the study.

Depression is associated with cognitive deficits and higher levels of anxiety-depression. In other words, these individuals have an increased tendency to react anxiously or with depressive symptoms to a situation. The scientists evaluated each participant’s levels of anxiety-depression using a questionnaire.

The researchers first examined the effects of PM2.5 exposure on cognition and characteristics associated with depression.

They found that PM2.5 exposure was associated with poor performance on cognitive tests involving reasoning and problem-solving. Higher anxiety-depression was also associated with PM2.5 exposure.

Next, the researchers examined brain networks involved in cognition and processing stress-related information and their association with PM2.5 exposure and genetic risk for depression.

The researchers measured the participants’ brain activity while conducting a simple cognitive task using functional magnetic resonance imaging.

To evaluate the influence of social stress on brain activity during the cognitive task, researchers showed the participants the image of a competitor and compared their performance with that of the competitor.

Higher levels of PM2.5 exposure were associated with slower reaction times during the cognitive task, and this effect of PM2.5 exposure became amplified during social stress.

Social stress had a more pronounced effect on brain networks in individuals with a genetic predisposition for depression and greater PM2.5 exposure.

The effect of social stress on brain networks due to the combination of genetic risk and air pollution was greater than the sum of the effects produced by each factor alone. These results suggest that air pollution may interact with genetic risk for depression to influence brain networks.

The dorsolateral prefrontal cortex is a brain region involved in several processes, including cognition. It was one of the key regions whose connectivity changed during the cognitive task in individuals with higher PM2.5 exposure and a genetic predisposition for depression.

Significantly, scientists have observed changes in the dorsolateral prefrontal cortex activity of healthy individuals with a genetic predisposition for depression and individuals with depression.

To further examine the interaction between genetic risk for depression and air pollution, the researchers investigated whether the combination of these factors differentially influenced brain networks involved in depression.

The researchers mapped the brain networks involved in depression by identifying brain regions expressing high levels of depression-associated genes.

The researchers used the online database Allen Brain Atlas, which provides detailed gene expression data for brain regions. They then identified brain regions that showed correlated expression of genes associated with depression.

The researchers examined if this pattern of coexpression of depression-associated genes in brain regions obtained using the atlas was similar to the brain connectivity patterns of the participants during the cognitive tests.

The pattern of coexpression of depression-associated genes derived using the atlas predicted brain connectivity patterns observed during the cognitive task. However, this was only the case for those with greater exposure to PM2.5 levels and a higher genetic predisposition for depression.

The correlation was weaker in individuals with a lower genetic risk of depression or lower exposure to PM2.5.

This suggests that exposure to PM2.5 air pollutants affects brain network functions associated with the genetic mechanisms of depression.

The researchers also conducted similar analyses focused on the association between the connectivity patterns of the dorsolateral prefrontal cortex with other brain regions and the coexpression of depression-associated genes in these regions.

The co-expression of depression-associated genes tracked the connectivity patterns to and from the dorsolateral prefrontal cortex in individuals with a genetic risk for depression, higher PM2.5 exposure levels, or both.

Interestingly, the co-expressed genes that correlated with brain connectivity patterns of the prefrontal cortex included some involved in neuroinflammation.

Depression is associated with chronic, low-grade inflammation, further suggesting that PM2.5 exposure may interact with depression-associated genes to increase the risk of depression.

“This is possibly the first study to directly implicate how genes for brain disorders operate in concert with each other and affect important cognitive and emotional functions in the live functioning brain, and the impact of air pollution and genes in multiplying the effects of each on these brain functions,” Dr. Tan told MNT.

“It is now [in] much less doubt that there are direct impacts of air pollution on how genes operate in the brain to affect risk for these neuropsychiatric disorders,” he added.

Dr. Tan noted: “Individuals can limit their outdoor activities when pollution is high and be mindful of their risk. Our study would strongly suggest that individuals with genetic risk, e.g., [a] family history of brain disorders, may need to be more careful, and minimize [as much as] possible their exposures to any air pollution.”

“Armed with this knowledge, leaders and public health officials around the globe have ample evidence that additional air pollution controls will lead to lower rates of depression — particularly in densely populated urban areas where air pollution is highest, and stress from socioeconomic and other inequities are greater.”

– Dr. Tan

Dr. Perry Sheffield, an environmental health researcher at Icahn School of Medicine at Mount Sinai, New York, noted that this study “helps drive home the point that when we talk about vulnerable groups — and here I mean groups of people who are more likely to experience negative health effects from a certain environmental exposure — we are ultimately talking about all of us. Each of us is vulnerable probably in multiple ways, and our specific vulnerabilities change during our lives.”

“Vulnerability can certainly be socially and unjustly determined — as we see driving racial and ethnic health disparities — but it can [also be] influenced by underlying genetics, as we see here in relation to air pollution and depression, and certainly by life stage or age,” she continued.

“The value of illustrating these associations in a study like this is that it helps tell the story of why clean air, water, and the overall environment matter for the health of people and communities.”

– Dr. Sheffield

Dr. Tan explained to MNT, “An important strength is that we have studied the brain impacts of air pollution using arguably the most direct measurements of live human brain function, which is MRI technologies.”

“We have studied a large sample of individuals. We have also eliminated many other factors that could have interfered with the study.” For instance, their sample was “socioeconomically homogeneous.”

“We have additionally examined patterns of how risk genes for depression operated in concert with each other in postmortem human brains and found that these patterns corresponded well with how the live human brain operated, and especially so in individuals with genetic risk for depression and exposed to high air pollution.”

Dr. Tan acknowledged that there were a few limitations to their approach, saying the team “studied only a limited set of genes for depression, and that’s likely only the tip of the iceberg.”

“There are likely many other genes [for] neuropsychiatric disorders implicated in the brain impacts of air pollution. Understanding these more comprehensively would enable us to better identify people at risk, and perhaps identify various pharmacological or other ways to protect the vulnerable,” he concluded.

U.S. Asks Court Not to Block Vaccine Requirement, Urges Workers to Get Vaccinated | Health News

States difficult the Biden administration’s vaccine need are envisioned to file their response to the White Dwelling on Tuesday just after the federal governing administration instructed the courtroom Monday that it has the authority to need big, personal companies to mandate coronavirus vaccinations for workers or to accomplish common tests.

The filings come just after the U.S. Court docket of Appeals for the 5th Circuit issued a stay on the rule more than the weekend, quickly blocking the requirement for non-public staff of massive companies. The court observed “trigger to believe that there are grave statutory and constitutional troubles with the Mandate,” and the Justice Office filed a 28-web page response echoing the Occupational Basic safety and Health and fitness Administration’s judgment that “these steps are needed to mitigate COVID transmission in the course of America’s workplaces.”

But opponents have criticized OSHA’s role in the vaccine prerequisite, arguing that necessitating coronavirus vaccinations or tests is a general public health and fitness measure and unrelated to place of work protection. In its submitting, the Justice Section rebuked the notion, citing tuberculosis and smallpox outbreaks in factories as examples of how place of work risks “have very long been recognized to consist of the risks of contracting communicable disorders as a end result of currently being in shut proximity to other personnel.”

The 7 days in Cartoons Nov. 8-12

The short term block in opposition to the rule came Saturday after Texas Attorney Common Ken Paxton filed a problem together with leaders from Louisiana, Mississippi, South Carolina, Utah and some personal corporations, calling it a “amazing abuse of federal electricity.” In most conditions, these kinds of stays implement only within the cluster of states that comprise the circuit that has jurisdiction. But in this case, the judges utilized the ruling nationwide mainly because of the rule’s broad-ranging effects. The continue to be has small tangible effects at current, given that the requirement is slated to take effect in early January.

The remain arrived just days soon after the Biden administration declared new particulars about its vaccine mandate or weekly testing solution for workforce of significant companies, which includes the timeline and that the rule carries the probability of office inspections and rigid financial penalties for noncompliance. The rule is envisioned to include much more than 80 million employees.

Inspite of ongoing authorized worries, the Biden administration on Monday urged American staff to get vaccinated as quickly as doable.

“The administration plainly has the authority to defend staff, and steps introduced by the president are developed to conserve lives and prevent the distribute of COVID-19,” principal deputy push secretary Karine Jean-Pierre explained for the duration of the White Household briefing Monday. “This is about trying to keep people today protected in the place of work.”

The Justice Division also argued that due to the fact the rule does not have an imminent outcome on People in america, slated to start in early January, “no purpose exists to rule on petitioners’ stay motions promptly.”

In a different letter Monday, the Justice Section asked that the multiple challenges in opposition to the administration’s rule be combined into a person scenario and by random variety be taken up by a single federal appeals court. The administration pretty much undoubtedly would like to see the circumstance taken out of the 5th Circuit, which is centered in Louisiana and has emerged as possibly the most politically conservative circuit in the country. The section claimed the lottery court docket selection should take location about Nov. 16.

Opposition to the president’s announcement last week was just about quick, with more than a dozen state leaders suing the administration around the rule.

And opposition to the requirement had been gearing up for months. Two dozen Republican state lawyers common in a letter right after the rule’s initial announcement in September urged the president to rethink his final decision to demand businesses with more than 100 workforce to mandate vaccinations or repeated coronavirus testing for workers, calling the program “disastrous and counterproductive.”

GOP governors were being brief to answer at the onset of the rule’s announcement as very well. Texas Gov. Greg Abbott named the necessity an “assault on personal businesses,” while Nebraska Gov. Pete Ricketts known as it a “gorgeous violation of personalized independence and abuse of the federal government’s electrical power.” And South Dakota Gov. Kristi Noem tweeted that her point out will “stand up to protect freedom,” telling Biden, “See you in court docket.”

But modern polls have revealed that the vast majority of workforce help vaccine mandates. In accordance to a new Gallup poll, 56{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of staff members would aid their employer imposing a vaccine mandate in the workplace, up from 46{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} in May perhaps.

Three things to watch for in Clover Health’s third-quarter earnings report today

Wellness-treatment get started-up Clover Health experiences its 3rd-quarter earnings Monday with the surge in Covid-19 delta instances hanging about its outcomes.

Clover Health is a Medicare Gain insurer, focused on applying data-driven main care to bring down healthcare charges.

Here are a few items to view when the business experiences just after the industry shut.  

Health care expenses

Clover Health and fitness posted a professional medical cost ratio of 111{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} for the second quarter this yr, due to bigger-than-anticipated Covid prices. That interprets to the company paying out out 11{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} much more than it collected in premiums, which resulted in greater-than-predicted losses in the course of the quarter. 

“We are additional regional than like [UnitedHealth] or Humana, so you’re a lot more subject matter to regional influences. And that I assume is compounded by anything like COVID,” defined Andrew Toy, Clover’s chief technologies officer, when I interviewed him at the HLTH meeting in Boston last month. “I feel that tends to make it more durable for buyers in the shorter expression to get a come to feel for selected figures around the firm.”

The firm claims part of that outsize influence is because of to the makeup of their membership additional than fifty percent arrive from underserved communities, when compared with an sector ordinary of 30{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809}.

Clover forecast professional medical fees will normalize at 94{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} to 97{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} for the comprehensive 12 months, but the delta surge in the third quarter could make for a skip on that evaluate. 

Humana, the nation’s next-biggest Medicare insurer, noted Covid-associated clinical costs nicely above anticipations for its third quarter, top the firm to decrease its earnings outlook for 2021.

Membership and revenue progress

With a possible decline, buyers will be leery about any indicators of a slowdown in earnings or membership expansion.

Clover has told buyers it expects once-a-year revenues of $1.4 billion to $1.6 billion for the full 12 months. Analysts estimate the company generated $415.8 million in earnings all through the third quarter, driven by the firm’s go into immediate key-treatment agreement relationships with physicians in the regular Medicare application.

The organization started off the 3rd quarter with 66,000 Medicare Benefit enrollees, placing it on speed to likely exceed its whole-12 months forecast of 68,000 to 70,000 members.  

For 2022, Clover will be featuring Medicare Advantage plans in 2 times as many counties as this year. Its larger sized rivals are expanding as very well.

UnitedHealth Group, which employs tens of thousands of medical professionals in its Optum Treatment unit, aims to leverage that principal treatment benefit in the next calendar year to rein in wellbeing coverage health care costs and present personal savings for its Medicare Gain associates.

“There’s an infrastructure develop that has to occur, which we have carried out in a lot of markets and we proceed to do to make the companies and specially Optum Treatment be ready to manage and [deliver] improved outcomes, decrease price tag, and eventually a easier experience,” UnitedHealthcare CEO Dirk McMahon instructed CNBC in an job interview in Boston final month. As element of that effort “they have to be ready to give information and facts to clients by means of their patient portal,” he stated.    

Stock response

The past 10 months have been a wild experience for Clover’s stock because the organization shown on the New York Inventory Exchange on Jan. 8 through a merger with venture trader Chamath Palihapitiya’s Social Money SPAC.

In February, Hindenburg Investigate accused the corporation of failing to disclose an SEC investigation in advance of its listing, which caught the attention of traders and shot shorter fascination in the stock to 40{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809}.

In June, retail traders on Reddit drove a limited squeeze, sending shares to a history large of just about $29 around the program of a week.

Clover’s Toy reported in an interview that he appreciated that vote of assurance in the enterprise from retail traders. 

“Retail investing is democratizing entry to monetary solutions and providers that probably ended up a minimal little bit concentrated just before, in phrases of access,” Toy reported. “Clover’s about bringing excellent wellbeing treatment to every person in the U.S. as we all appear at Medicare entry. So, I believe it really is a great theme there.”

But that meme trade has light, and Clover shares are down 73{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} from the June high. Reaction to any upside earnings surprise might be fairly muted, as limited curiosity in the stock has fallen to 13.4{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} this thirty day period, according to FactSet information.  

Most of the well being-tech sector shares outlined about the previous couple of many years are deep in bear current market territory. Evercore ISI analyst Elizabeth Anderson mentioned the all round pullback in the tech sector has been exacerbated by this year’s reopening trade.

“With the pandemic and all the interest on overall health treatment, you did have a lot of nonhealth-care buyers investing in overall health treatment … [and] you have witnessed those individuals go to other sectors,” Anderson reported. She pointed out, having said that, that health tech corporations have “continued to place up great development despite that … and can carry on to execute really nicely from a income and progress point of view.”

Why vaccines are ‘not a silver bullet’

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New research examines the risk of household transmission of the Delta variant, despite vaccination. Christopher Furlong/Getty Images
  • The COVID-19 vaccine effectively prevents severe illness and death.
  • The Delta (B.1.617.2) variant of SARS-CoV-2 is spreading globally in populations with high vaccination rates.
  • 1 in 4 fully vaccinated people who have exposure to the Delta variant in the home are likely to get the infection.
  • The peak viral load of the Delta virus does not differ between fully vaccinated and nonvaccinated individuals.
  • The elimination of the Delta strain of the virus takes place more quickly in vaccinated individuals.

The SARS-CoV-2 Delta variant is the most widely spread variation of the virus, accounting for about 99.8{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of cases in the United Kingdom. The highly transmissible Delta variant is spreading globally, including in populations with high vaccination rates.

Several studies have shown the effectiveness of the COVID-19 vaccines in protecting from severe disease and death. Research has also confirmed that fully vaccinated individuals have a lower risk of infection with both the Alpha (B.1.1.7) and Delta variants compared with unvaccinated people.

However, to date, vaccination has not limited the spread of the Delta variant. A new study, which appears in The Lancet Infectious Diseases, has found that vaccination alone is not enough to stop the household transmission of the Delta variant.

Researchers from Imperial College London, the UK Health Security Agency, and the Manchester Foundation NHS Trust collaborated to carry out this “real life” study of household transmission in the U.K.

The researchers recruited 621 people over 12 months from Sept 2020. Of these individuals, 163 (26{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809}) had a SARS-CoV-2 infection. The team used genome sequencing to identify the variant:

  • 71 participants had a Delta variant infection
  • 42 had an Alpha variant infection
  • 50 had a pre-Alpha variant infection

The scientists used the secondary attack rate (SAR) to study the spread of the SARS-CoV-2 virus in households. The SAR for exposed household contacts for the Delta variant was 26{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809}, regardless of vaccination status. However, the researchers found that 25{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of vaccinated household contacts tested positive for the SARS-CoV-2 Delta virus compared with roughly 38{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of unvaccinated household contacts.

Dr. Simon Clarke, who is an associate professor in cellular microbiology at the University of Reading and was not involved in the study, says:

“These findings show that the vaccines remain an effective way to drive down [SARS-CoV-2] infection, but they are not a silver bullet. Infection in the wider community can still be amplified by transmission at home.”

The ability of the vaccine to prevent infection with the Delta variant in the household was roughly 34{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809}.

Interestingly, the study found vaccination status to have no effect on the maximum amount of the SARS-CoV-2 Delta virus present, known as the peak viral load. Other studies have found similar viral loads in nasal swabs, irrespective of vaccine status.

“These similar peak viral loads in vaccine breakthrough infections may explain why infected vaccinated people were just as likely to pass on infection as infected unvaccinated people,” says Prof. Peter Openshaw, professor of experimental medicine at Imperial College London.

Despite no difference in viral load, the body reduced the amount of SARS-CoV-2 Delta in the airways more quickly in vaccinated people than in unvaccinated people.

Speaking with Medical News Today, Dr. Sarah Pitt, principal lecturer at the School of Applied Sciences, University of Brighton, explained: “What is interesting about this study is because they followed people up for 3 weeks, they could see how much virus they were shedding and for how long […]. This could be a useful finding, as it might provide new information about how long people should self-isolate for once they have tested positive.”

The researchers noted that the time between the completion of vaccination and study recruitment was longer for PCR-positive contacts than for PCR-negative contacts. This is an important finding according to Prof. Penny Ward, independent pharmaceutical physician, visiting professor in pharmaceutical medicine at King’s College London.

She says that this may indicate that “waning individual protection may occur from 3 months rather than the 6 months currently scheduled for booster doses.”

The researchers note that they only included the contacts of symptomatic individuals in this study. Despite each of these people being the first member of their household to have a PCR-positive test, it is possible that another household member may already have had the infection.

According to Professor Emeritus Keith Neal of the University of Nottingham, this study helps with “understanding why Delta is now the predominant variant worldwide. Delta is able to spread between vaccinated people in a way previous variants did not.”

The research shows that the Delta variant of the SARS-CoV-2 virus can transmit from fully vaccinated people, who can have similar amounts of it in their airways as someone who is unvaccinated.

However, the amount of the virus in the airways of a fully vaccinated individual clears more quickly, suggesting that the risk of transmission lasts for less time than it would if they were not vaccinated.

Dr. Clarke says: “[T]he fact that a vaccine reduces someone’s chance of getting [the infection] in the first place means that while the vaccines don’t provide complete protection against transmission, they are not completely ineffective.”

For live updates on the latest developments regarding the novel coronavirus and COVID-19, click here.

More than 10,000 patients caught Covid-19 in a hospital, analysis shows. They never made it out

They left with covid-19 — if they left at all.

More than 10,000 patients were diagnosed with covid in a U.S. hospital last year after they were admitted for something else, according to federal and state records analyzed exclusively for KHN. The number is certainly an undercount, since it includes mostly patients 65 and older, plus California and Florida patients of all ages.

Yet in the scheme of things that can go wrong in a hospital, it is catastrophic: About 21{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of the patients who contracted covid in the hospital from April to September last year died, the data shows. In contrast, nearly 8{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of other Medicare patients died in the hospital at the time.

Steven Johnson, 66, was expecting to get an infection cut out of his hip flesh and bone at Blake Medical Center in Bradenton, Florida, last November. The retired pharmacist had survived colon cancer and was meticulous to avoid contracting covid. He could not have known that, from April through September, 8{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of that hospital’s Medicare covid patients were diagnosed with the virus after they were admitted for another concern.

Johnson had tested negative for covid two days before he was admitted. After 13 days in the hospital, he tested positive, said his wife, Cindy Johnson, also a retired pharmacist.

Soon he was struggling to clear a glue-like phlegm from his lungs. A medical team could hardly control his pain. They prompted Cindy to share his final wishes. She asked: “Honey, do you want to be intubated?” He responded with an emphatic “no.” He died three days later.

After her husband tested positive, Cindy Johnson, trained in contact tracing, quickly got a covid test. She tested negative. Then she thought about the large number of hospital staffers flowing into and out of his room — where he was often unmasked — and suspected a staff member had infected him. That the hospital, part of the HCA Healthcare chain, still has not mandated staff vaccinations is “appalling,” she said.

“I’m furious,” she said.

“How can they say on their website,” she asked, “that the safety precautions ‘we’ve put into place make our facilities among the safest possible places to receive healthcare at this time’?”

Blake Medical Center spokesperson Lisa Kirkland said the hospital is “strongly encouraging vaccination” and noted that it follows Centers for Disease Control and Prevention and federal and state guidelines to protect patients. President Joe Biden has called for all hospital employees to be vaccinated, but the requirement could face resistance in a dozen states, including Florida, that have banned vaccine mandates.
Cindy Johnson holds a pillow made from a shirt her husband, Steven, used to wear. Steven died of covid-19 in December 2020, and Cindy believes he contracted the virus at Blake Medical Center in Bradenton, Florida, where he was admitted for an infection in his hip. (Eve Edelheit for KHN)
Overall, the rate of in-hospital spread among Medicare and other patients was lower than in other countries, including the United Kingdom, which makes such data public and openly discusses it. On average, about 1.7{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of U.S. hospitalized covid patients were diagnosed with the virus in U.S. hospitals, according to an analysis of Medicare records from April 1 to Sept. 30, 2020, provided by Dr. James Kennedy, founder of CDIMD, a Nashville-based consulting and data analytics company.

Yet the rate of infection was far higher in 38 hospitals where 5{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} or more of the Medicare covid cases were documented as hospital-acquired. The data is from a challenging stretch last year when protective gear was in short supply and tests were scarce or slow to produce results. The Medicare data for the fourth quarter of 2020 and this year isn’t available yet, and the state data reflects April 1 through Dec. 31, 2020.

A KHN review of work-safety records, medical literature and interviews with staff at high-spread hospitals points to why the virus took hold: Hospital leaders were slow to appreciate its airborne nature, which made coughing patients hazardous to roommates and staff members, who often wore less-protective surgical masks instead of N95s. Hospitals failed to test every admitted patient, enabled by CDC guidance that leaves such testing to the “discretion of the facility.” Management often failed to inform workers when they’d been exposed to covid and so were at risk of spreading it themselves.
Spread among patients and staffers seemed to go hand in hand. At Beaumont Hospital, Taylor, in Michigan, 139 employee covid infections were logged between April 6 to Oct. 20 last year, a hospital inspection report shows. Nearly 7{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of the Medicare patients with covid tested positive after they were admitted to that hospital for something else, the federal data shows. A hospital spokesperson said tests were not available to screen all patients last year, resulting in some late diagnoses. He said all incoming patients are tested now.
Tracking covid inside health facilities is no new task to federal officials, who publicly report new staff and resident cases weekly for each U.S. nursing home. Yet the Department of Health and Human Services reports data on covid’s spread in hospitals only on a statewide basis, so patients are in the dark about which facilities have cases.
KHN commissioned analyses of hospital billing records, which are also used more broadly to spot various hospital-acquired infections. For covid, the data has limitations. It can pick up some community-acquired cases that were slow to show up, as it can take two to 14 days from exposure to the virus for symptoms to appear, with the average being four to five days. The records do not account for cases picked up in an emergency room or diagnosed after a hospital patient was discharged.
Linda Moore, pictured with her daughter Stacey Taylor, died of covid-19 in July 2020. Her daughter Trisha Tavolazzi says Moore tested positive after at least 15 days at Havasu Regional Medical Center in Lake Havasu City, Arizona. (Stacey Taylor)

Linda Moore, 71, tested positive at least 15 days into a hospital stay for spinal surgery, according to her daughter Trisha Tavolazzi. Her mother was at Havasu Regional Medical Center in Lake Havasu City, Arizona, which did not have a higher-than-average rate of internal spread last summer.

The hospital implemented “rigorous health and safety protocols to protect all of our patients” during the pandemic, said hospital spokesperson Corey Santoriello, who would not comment on Moore’s case, citing privacy laws.

Moore was airlifted to another hospital, where her condition only declined further, her daughter said. After the ventilator was removed, she clung to life fitfully for 5½ hours, as her daughter prayed for her mother to find her way to heaven.

“I asked her mom and her dad and her family and prayed to God, ‘Please just come show her the way,'” Tavolazzi said. “I relive it every day.”

When Tavolazzi sought answers from the hospital about where her mom got the virus, she said, she got none: “No one ever called me back.”

Two Negative Covid Tests, Then ‘Patient Zero’

As the second surge of covid subsided last September, doctors from the prestigious Brigham and Women’s Hospital published a reassuring study: With careful infection control, only two of 697 covid patients acquired the virus within the Boston hospital. That is about 0.3{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of patients ― about six times lower than the overall Medicare rate. Brigham tested every patient it admitted, exceeding CDC recommendations. It was transparent and open about safety concerns.
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But the study, published in the high-profile JAMA Network Open journal, conveyed the wrong message, according to Dr. Manoj Jain, an infectious-disease physician and adjunct professor at the Rollins School of Public Health at Emory University. Covid was spreading in hospitals, he said, and the study buried “the problem under the rug.”

Before the virtual ink on the study was dry, the virus began a stealthy streak through the elite hospital. It slipped in with a patient who tested negative twice ― but turned out to be positive. She was “patient zero” in an outbreak affecting 38 staffers and 14 patients, according to a study in Annals of Internal Medicine initially published Feb. 9.
That study’s authors sequenced the genome of the virus to confirm which cases were related ― and precisely how it traveled through the hospital.

As patients were moved from room to room in the early days of the outbreak, covid spread among roommates 8 out of 9 times, likely through aerosol transmission, the study says. A survey of staff members revealed that those caring for coughing patients were more likely to get sick.

The virus also appeared to have breached the CDC-OK’d protective gear. Two staff members who had close patient contact while wearing a surgical mask and face shield still wound up infected. The findings suggested that more-protective N95 respirators could help safeguard staff.

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Brigham and Women’s now tests every patient upon admission and again soon after. Nurses are encouraged to test again if they see a subtle sign of covid, said Dr. Erica Shenoy, associate chief of the Infection Control Unit at Massachusetts General Hospital, who helped craft policy at Brigham.

She said nurses and environmental services workers are at the table for policymaking: “I personally make it a point to say, ‘Tell me what you’re thinking,'” Shenoy said. “‘There’s no retribution because we need to know.'”

CDC guidelines, though, left wide latitude on protective gear and testing. To this day, Shenoy said, hospitals employ a wide range of policies.

The CDC said in a statement that its guidelines “provide a comprehensive and layered approach to preventing transmission of SARS-CoV-2 in healthcare settings,” and include testing patients with “even mild symptoms” or recent exposure to someone with covid.

Infection control policies are rarely apparent to patients or visitors, beyond whether they’re asked to wear a mask. But reviews of public records and interviews with more than a dozen people show that at hospitals with high rates of covid spread, staff members were often alarmed by the lack of safety practices.

Nurses Sound the Alarm on Covid Spread

As covid crept into Florida in spring 2020, nurse Victoria Holland clashed with managers at Blake Medical Center in Bradenton, where Steven Johnson died.

She said managers suspended her early in the pandemic after taking part in a protest and “having a hissy fit” when she was denied a new N95 respirator before an “aerosol-generating” procedure. The CDC warns that such procedures can spread the virus through the air. Before the pandemic, nurses were trained to dispose of an N95 after each patient encounter.

When the suspension was over, Holland said, she felt unsafe. “They told us nothing,” she said. “It was all a little whisper between the doctors. You had potential covids and you’d get a little surgical mask because [they didn’t] want to waste” an N95 unless they knew the patient was positive.

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Holland said she quit in mid-April. Her nursing colleagues lodged a complaint with the Occupational Safety and Health Administration in late June alleging that staff “working around possible Covid-19 positive cases” had been denied PPE. Staff members protested outside the hospital in July and filed another OSHA complaint that said the hospital was allowing covid-exposed employees to keep working.

Kirkland, the Blake spokesperson, said the hospital responded to OSHA and “no deficiencies were identified.”

The Medicare analysis shows that 22 of 273 patients with covid, or 8{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809}, were diagnosed with the virus after they were admitted to Blake. That’s about five times as high as the national average.

Kirkland said “there is no standard way for measuring COVID-19 hospital-associated transmissions” and “there is no evidence to suggest the risk of transmission at Blake Medical Center is different than what you would find at other hospitals.”

In Washington, D.C., 34 Medicare covid patients contracted the virus at MedStar Washington Hospital Center, or nearly 6{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of its total, the analysis shows.

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Unhappy with the safety practices ― which included gas sterilization and reuse of N95s — National Nurses United members protested on the hospital lawn in July 2020. At the protest, nurse Zoe Bendixen said one nurse had died of the virus and 50 had gotten sick: “[Nurses] can become a source for spreading the disease to other patients, co-workers and family members.”

Nurse Yuhana Gidey said she caught covid after treating a patient who turned out to be infected. Another nurse ― not managers doing contact tracing ― told her she’d been exposed, she said.

Nurse Kimberly Walsh said in an interview there was an outbreak in a geriatric unit where she worked in September 2020. She said management blamed nurses for bringing the virus into the unit. But Walsh pointed to another problem: The hospital wasn’t covid-testing patients coming in from nursing homes, where spread was rampant last year.

MedStar declined a request for an interview about its infection control practices and did not respond to specific questions.

While hospitals must track and publicly report rates of persistent infections like C. diff, antibiotic-resistant staph and surgical site infections, similar hospital-acquired covid rates are not reported.
KHN examined a different source of data that Congress required hospitals to document about “hospital-acquired conditions.” The Medicare data, which notes whether each covid case was “present on admission” or not, becomes available months after a hospitalization in obscure files that require a data-use agreement typically granted to researchers. KHN counted cases, as federal officials do, in some instances in which the documentation is deemed insufficient to categorize a case (see data methodology, below).

For this data, whether to deem a covid case hospital-acquired lies with medical coders who review doctors’ notes and discharge summaries and ask doctors questions if the status is unclear, said Sue Bowman, senior director of coding policy and compliance at American Health Information Management Association.

She said medical coders are aware that the data is used for hospital quality measures and would be careful to review the contract tracing or other information in the medical record.

If a case was in the data KHN used, “that would mean it was acquired during the hospital stay either from a health care worker or another patient or maybe if a hospital allowed visitors, from a visitor,” Bowman said. “That would be a fair interpretation of the data.”

The high death rate for those diagnosed with covid during a hospital stay — about 21{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} — mirrors the death rate for other Medicare covid patients last year, when doctors had few proven methods to help patients. It also highlights the hazard unvaccinated staffers pose to patients, said Jain, the infectious-disease doctor. The American Hospital Association estimates that about 42{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809} of U.S. hospitals have mandated that all staff members be vaccinated.

“We don’t need [unvaccinated staff] to be a threat to patients,” Jain said. “[Hospital] administration is too afraid to push the nursing staff, and the general public is clueless at what a threat a non-vaccinated person poses to a vulnerable population.”

Cindy Johnson believes her husband, Steven, caught covid-19 from staff at Blake Medical Center in Bradenton, Florida, in November 2020. After his death, she asked a doctor who sees patients at the hospital to take down the big "OPEN & SAFE" sign outside. (Cindy Johnson)
Cindy Johnson said the hospital where she believes her husband contracted covid faced minimal scrutiny in a state inspection, even after she said she reported that he caught covid there. She explored suing, but an attorney told her it would be nearly impossible to win such a case. A 2021 state law requires proof of “at least gross negligence” to prevail in court.

Johnson did ask a doctor who sees patients at the hospital for this: Please take down the big “OPEN & SAFE” sign outside.

Within days, the sign was gone.

KHN requested custom analyses of Medicare, California and Florida inpatient hospital data to examine the number of covid-19 cases diagnosed after a patient’s admission.

The Medicare and Medicare Advantage data, which includes patients who are mostly 65 or older, is from the Medicare Provider Analysis and Review (MedPAR) file and was analyzed by CDIMD, a Nashville-based medical code consulting and data analytics firm. The data is from April 1 through Sept. 30, 2020. The data for the fourth quarter of 2020 is not yet available.

That data shows the number of inpatient Medicare hospital stays in the U.S., including the number of people diagnosed with covid and the number of admissions for which the covid diagnosis was not “present on admission.” A condition not “present on admission” is presumed to be hospital-acquired. The data is for general acute-care hospitals, which may include a psychiatric floor, and not for other hospitals such as Veterans Affairs or stand-alone psychiatric hospitals.

KHN requested a similar analysis from California’s Department of Health Care Access and Information of its hospital inpatient data. That data was from April 1 through Dec. 31, 2020, and covered patients of all ages and payer types and in general, private psychiatric and long-term acute-care hospitals. Etienne Pracht, a University of South Florida researcher, provided the number of Florida covid patients who did not have the virus upon hospital admission for all ages at general and psychiatric hospitals from April 1 through Dec. 31, 2020. KHN subtracted the number of Medicare patients in the MedPAR data from the Florida and California all-payer datasets so they would not be counted twice.

To calculate the rate of Medicare patients who got covid or died, KHN relied on the MedPAR data for April through September. That data includes records for 6,629 seniors, 1,409 of whom, or 21{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809}, died. California data for all ages and payer types from April through December shows a similar rate: Of 2,115 who contracted covid after hospital admission, 435, or 21{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809}, died. The MedPAR data was also used to calculate the national nosocomial covid rate of 1.7{cfdf3f5372635aeb15fd3e2aecc7cb5d7150695e02bd72e0a44f1581164ad809}, with 6,629 of 394,939 covid patients diagnosed with the virus that was deemed not present on admission.

Data on whether an inpatient hospital diagnosis was present on admission is used by Medicare for payment determinations and is intended to incentivize hospitals to prevent infections acquired during hospital care. It is also used by the U.S. Agency for Healthcare Research and Quality to “assist in identifying quality of care issues.”

Whether covid is acquired in a hospital or in the community is measured in different ways. Some nations assume the virus is hospital-acquired if it is diagnosed seven or more days after admission, while statewide U.S. data counts cases only after 14 days.

Medical coders who examine medical records for this inpatient billing data focus on the physician’s admission, progress and discharge notes to determine whether covid was present on admission. They do not have a set number of days they look for and are trained to query physicians if the case is unclear, according to Sue Bowman, senior director of coding policy and compliance at the American Health Information Management Association.

KHN tallied the cases in which covid was logged in the data as not “present on admission” to the hospital. Some covid cases are coded as “U” for having insufficient documentation to make a determination. Since Medicare and AHRQ consider the “U” to be an “N” (or not present on admission) for the purposes of payment decisions and quality indicators, KHN chose to count those cases in the grand total.

In 409 of 6,629 Medicare cases and in 70 of 2,185 California cases, the “present on admission” indicator was “U.” The Florida data did not include patients whose “present on admission” indicator was “U.” Medical coders have another code, “W,” for “clinically undetermined” cases, which consider a condition present on admission for billing or quality measures. Medical coders use the “U” (leaning toward “not present on admission”) and “W” (leaning toward “present on admission”) when there is some uncertainty about the case.

The Medicare MedPAR data includes about 2,500 U.S. hospitals that had at least a dozen covid cases from April through September 2020. Of those, 1,070 reported no cases of hospital-acquired covid in the Medicare records. Data was suppressed for privacy reasons for about 1,300 hospitals that had between one and 11 hospital-acquired covid cases. There were 126 hospitals reporting 12 or more cases of covid that were not present on admission or unknown. For those, we divided the number of hospital-acquired cases by the total number of patients with covid to arrive at the rate of hospital-acquired cases, as is standard in health care.