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Microbes Unknown to Science Discovered on The International Space Station

The menagerie of bacterial and fungal species living among us is ever growing – and this is no exception in low-gravity environments, such as the International Space Station (ISS).

 

Researchers from the United States and India working with NASA have now discovered four strains of bacteria living in different places in the ISS – three of which were, until now, completely unknown to science.

Three of the four strains were isolated back in 2015 and 2016 – one was found on an overhead panel of the ISS research stations, the second was found in the Cupola, the third was found on the surface of the dining table; the fourth was found in an old HEPA filter returned to Earth in 2011.  

All four of the strains belong to a family of bacteria found in soil and freshwater; they are involved in nitrogen fixation, plant growth, and can help stop plant pathogens. Basically, good bacteria to have around if you’re growing things.

You might wonder what such soil bacteria were doing all the way up on the ISS, but the astronauts living on the space station have been growing small amounts of food for years, so it’s unsurprising that we’ve found plant-related microbes aboard.

One of the strains – the HEPA-filter find – was identified as a known species called Methylorubrum rhodesianum. The other three were sequenced and found to all belong to the same, previously unidentified species, and the strains were named IF7SW-B2T, IIF1SW-B5, and IIF4SW-B5.

 

The team, lead by University of Southern California geneticist Swati Bijlani, has proposed calling the new species Methylobacterium ajmalii after Ajmal Khan, a renowned Indian biodiversity scientist. This new find is also closely related to an already known species called M. indicum.

“To grow plants in extreme places where resources are minimal, isolation of novel microbes that help to promote plant growth under stressful conditions is essential,” two of the team, Kasthuri Venkateswaran and Nitin Kumar Singh from NASA’s JPL, explained in a press statement.

Considering we already know that these microbes can survive the harsh conditions of the ISS, the team put the four strains through genetic analysis to look for genes that could be used to help promote plant growth.

“The whole genome sequence assembly of these three ISS strains reported here will enable the comparative genomic characterization of ISS isolates with Earth counterparts in future studies,” the team writes in their study.

“This will further aid in the identification of genetic determinants that might potentially be responsible for promoting plant growth under microgravity conditions and contribute to the development of self-sustainable plant crops for long-term space missions in future.”

The researchers found that one of the ISS strains – IF7SW-B2T – had promising genes involved in plant growth, including a gene for an enzyme essential for cytokinin, which promotes cell division in roots and shoots.

There’s much more research to be done here – the researchers acknowledge that they’ve barely scratched the surface of microbial diversity on the space station. Around 1,000 samples have already been collected on the ISS, but are still awaiting a trip back to Earth.

Just imagine the exciting space-faring microbes we are yet to discover!

The research has been published in Frontiers in Microbiology.

 

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Hedgehogs and rabbits ‘could harbour new coronavirus strains’ study reveals

Common UK garden animals like hedgehogs, rabbits and even the domestic cat have the potential to harbour new strains of coronavirus, a new study reveals.

UK researchers used machine learning to predict associations between 411 strains of coronavirus and 876 potential mammal host species. 

Their machine learning model integrated characteristics extracted from genomes, such as protein structure, as well as ecological and other traits.  

The results have ‘implicated’ the common hedgehog (Erinaceus europaeus), the European rabbit (Oryctolagus cuniculus) and the domestic cat (Felis catus) as predicted hosts for new coronaviruses. 

Amongst the ‘highest priority’ is the lesser Asiatic yellow bat (Scotophilus kuhlii), a known coronavirus host that’s common in east Asia but not well studied.  

The potential scale of novel coronavirus generation in wild and domesticated animals ‘may have been highly underappreciated’, the experts, from the University of Liverpool, say.  

Pictured, a wild European hedgehog. The potential scale of novel coronavirus generation in wild and domesticated animals may have been highly underappreciated, suggests a machine-learning study published in Nature Communications

Predicting which animals could potentially be the source of a future coronavirus outbreak may help reduce the risk of emergence in human populations. 

‘Our results demonstrate the large under-appreciation of the potential scale of novel coronavirus generation in wild and domesticated animal,’ say the researchers in their paper, published in Nature Communications. 

‘These hosts represent new targets for surveillance of novel human pathogenic coronaviruses.’ 

There may be 30 times more host species than currently known that have the potential to harbour new strains of SARS-CoV-2, the team say. 

Their analysis also suggests there are at least 11 times more associations between mammalian species and coronavirus strains than empirical observations have so far demonstrated. 

In addition, they estimate that there are over 40 times more mammal species with four or more coronavirus strains than has previously been observed. 

For example, the Asian palm civet and greater horseshoe bat are predicted to be host to 32 and 68 different coronaviruses, respectively. 

European rabbit (Oryctolagus cuniculus). Researchers say in their paper: ‘Our results also implicate the common hedgehog (Erinaceus europaeus), the European rabbit (Oryctolagus cuniculus) and the domestic cat (Felis catus) as predicted hosts for SARS-CoV-2’

CATS AND CORONAVIRUS  

A pet cat became the first animal in the UK to be diagnosed with Covid-19, it was revealed in July 2020.

Officials said the cat – which wasn’t identified but lived in England – caught coronavirus from its owners and ‘not the other way round’.

Downing Street said the feline suffered from nasal discharge and some shortness of breath, a symptom that also strikes humans.

Experts have generally reiterated since the pandemic began that domestic cats don’t carry the virus to humans.

There have been a small number of cases of cats having Covid-19 around the world, but in those instances it was likely the humans had infected the cats, according to the British Veterinary Association (BVA).

The fact that cats can carry the coronavirus on their fur makes them as much as a risk to humans as other high-contact physical objects like doorknobs, the BVA said.

As well as the hedgehog and the rabbit, predicted hosts in which SARS-CoV-2 might potentially recombine with other coronaviruses include the dromedary camel, which is the primary route of transmission of MERS-CoV to human.

The hedgehog and rabbit have previously been confirmed as hosts for other betacoronaviruses, although these ‘have no appreciable significance to human health’, the team add. 

Some mammals identified in the study as potential hosts for new coronavirus strains – like horseshoe bats, palm civets and pangolins – have already been linked to either SARS-CoV-1, which caused the 2003 SARS outbreak, or SARS-CoV-2, which causes Covid-19.

Evidence already suggests SARS-CoV-2 originated in horseshoe bats, although it’s likely the virus passed to humans through pangolins, a scaly mammal often confused for a reptile. 

Meanwhile, the masked palm civet was found to carry SARS-CoV-1, the coronavirus that killed 775 people and infected more than 8,000 globally during the epidemic in 2003. 

New coronaviruses can emerge when two different strains co-infect an animal, causing the viral genetic material to recombine. 

SARS-CoV-2 appears to be a recent mix, or genetic recombination, of coronaviruses. 

As a result of this recombination, one of the proteins of SARS-CoV-2 enables the virus to enter the cells of humans. 

Despite the mass rollout of Covid-19 vaccines, the University of Liverpool team say the recombination of other coronaviruses with SARS-CoV-2 is the ‘immediate threat to public health’. 

The research paper says: ‘Amongst the highest priority is the lesser Asiatic yellow bat [Scotophilus kuhlii, pictured], a known coronavirus host, common in east Asia but not well studied’

Illustration showing SARS-CoV-2 coronavirus, the virus which causes Covid-19. There may be 30 times more host species than currently known that have the potential to harbour new strains of SARS-CoV-2, according to the University of Liverpool experts

This recombination could birth a virus with all the worse aspects of different viruses in the coronavirus family (coronaviridae). 

‘Such recombination could readily produce further novel viruses with both the infectivity of SARS-CoV-2 and additional pathogenicity or viral tropism from elsewhere in the coronaviridae,’ they say. 

However, there’s a diverse range of mammal species ‘not yet associated with SARS-CoV-2 recombination’, but which are both predicted to host SARS-CoV-2 and other coronaviruses, the experts say. 

Understanding how susceptible different mammals are to different coronaviruses could offer insights into where recombination might occur.   

SARS-CoV-2 is likely to have its ancestral origins in a bat species but may have reached humans through an intermediary species, such as pangolins – a scaly mammal often confused for a reptile (pictured)

The authors acknowledge that their results draw on limited data on coronavirus genomes and virus-host associations, and that there are study biases for certain animal species, all of which present uncertainty in the predictions.  

However, the identification of potentially high-risk species for the generation of new strains of coronavirus may assist surveillance efforts.

‘Such information could help inform prevention and mitigation strategies and provide a vital early warning system for future novel coronaviruses,’ they say.    

World Health Organisation investigators admitted earlier this month that their research mission in Wuhan will not reach its goal of revealing how coronavirus jumped from animals to humans – meaning we may never know its origin. 

Scientists in China believe SARS-CoV-2 came from bats

The human COVID-19 SARS-CoV-2 virus split from its closest known relative – another coronavirus from a horseshoe bat (pictured) – about 30 to 40 years ago, according to University of Sydney Professor Simon Hothe jump to humans most likely happened more recently

Researchers at the Chinese Academy of Sciences, the People’s Liberation Army and Institut Pasteur of Shanghai came to the conclusion that the coronavirus may have come from bats.

In a statement, the team said: ‘The Wuhan coronavirus’ natural host could be bats… but between bats and humans there may be an unknown intermediate.

Research published in the Lancet also determined bats as the most probable original host of the virus after samples were taken from the lungs of nine patients in Wuhan.

The team suggested that bats passed the disease on to an ‘intermediate’ host which was at the Huanan seafood market in Wuhan before being passed on to the ‘terminal host’ — humans.

Authorities have pointed the blame on food markets in Wuhan, the Chinese city at the centre of the outbreak that scientists are scrambling to contain.

Rodents and bats among other animals are slaughtered and sold in traditional ‘wet markets’, which tourists flock to see the ‘real’ side of the country. 

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CDC reports 5 new cases of UK COVID-19 variant in Iowa

The Centers for Disease Control and Prevention reported five new cases of the U.K. variant of COVID-19 in the state of Iowa. On Feb. 1, the first three cases were reported in Iowa. As of Thursday night, there are eight cases. The variant named B.1.1.7 by the CDC, was first discovered in the United Kingdom in January. According to the CDC, the variant “may be associated with an increased risk of death compared to other variants. More studies are needed to confirm this finding.” There are two other variants that health organizations are watching. The one labeled P.1 by the CDC is from Brazil. The other is labeled B.1.351 and was found in South Africa. Neither of these has been found in Iowa yet. Of Iowa’s neighboring states, only Nebraska and South Dakota have not reported any new variants of coronavirus.

The Centers for Disease Control and Prevention reported five new cases of the U.K. variant of COVID-19 in the state of Iowa.

On Feb. 1, the first three cases were reported in Iowa. As of Thursday night, there are eight cases.

The variant named B.1.1.7 by the CDC, was first discovered in the United Kingdom in January.

According to the CDC, the variant “may be associated with an increased risk of death compared to other variants. More studies are needed to confirm this finding.”

There are two other variants that health organizations are watching. The one labeled P.1 by the CDC is from Brazil. The other is labeled B.1.351 and was found in South Africa. Neither of these has been found in Iowa yet.

Of Iowa’s neighboring states, only Nebraska and South Dakota have not reported any new variants of coronavirus.

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New strains of coronavirus create potential for spring surge, Utah doctors say

MURRAY — If coronavirus variants now spreading throughout the United States become dominant strains, health experts fear the potential for a springtime surge.

That’s why the speed of the vaccine campaign and public health protective measures are so important.

On Jan. 15, the Utah Department of Health confirmed the first case of the B.1.1.7 COVID-19 variant in Utah, referred to as the “U.K. variant,” through ongoing genetic sequencing of positive COVID-19 samples.

According to Dr. Eddie Stenehjem, an infectious disease doctor at Intermountain Healthcare, Utahns need to keep up the personal protective measures until the vaccine makes an impact.

“From an epidemiology standpoint, we are moving in the right direction, and we need to make sure that we keep doing what we’re doing,” said Stenehjem.

While Utah’s critical COVID-19 numbers are currently headed in the right direction, Stenehjem said the variants could change that.

“It’s definitely a concern of ours to be really monitoring this current situation with the viral variants,” he said. “It just emphasizes the fact that we need to get vaccines out because it looks like the vaccines are protective against these variants.”

It’s a race to get the vaccines out faster than the variants can spread.


We are on a good track right now, as long as people continue to mask up, limit their contacts and don’t gather in large groups.

–Dr. Eddie Stenehjem, infectious disease doctor at Intermountain Healthcare


An updated COVID-19 forecast from the University of Washington’s Institute for Health Metrics and Evaluation, that includes the highly transmissible variants, shows the potential for an additional 25,000 deaths over the next three months. Researchers project a total of 160,000 more deaths before May 1.

The U.K. strain has now been detected in 33 states, including Utah.

“If it was a predominant mode of infection here in Utah, I think we would know about it at this point because of the amount that they are sequencing,” said Stenehjem.

While state health officials continue to track the strains, Stenehjem said we need to keep protecting ourselves.

“We are on a good track right now, as long as people continue to mask up, limit their contacts and don’t gather in large groups,” he said.

If Utah can get vaccines out quickly, he said, and get more of our communities protected, then we can worry less about the variant strains.

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US coronavirus: Fauci urges vaccinations to stop new virus strains

“You need to get vaccinated when it becomes available as quickly and as expeditiously as possible throughout the country,” Fauci, President Joe Biden’s chief medical adviser, said in a virtual news briefing with the White House Covid-19 response team. “And the reason for that is … viruses cannot mutate if they don’t replicate. And if you stop their replication by vaccinating widely and not giving the virus an open playing field to continue to respond to the pressures that you put on it, you will not get mutations.”

Speaking to CNN’s Wolf Blitzer later Monday, Fauci said even if someone has had coronavirus, there’s a “very high rate” of being reinfected with the new variants if they become dominant.

“If it becomes dominant, the experience of our colleagues in South Africa indicate that even if you’ve been infected with the original virus that there is a very high rate of reinfection to the point where previous infection does not seem to protect you against reinfection,” Fauci said on CNN.

CNN Chief Medical Correspondent Dr. Sanjay Gupta said the possibility of reinfection by one of the variants is another reason why people should get vaccinated.

“A lot of people say, ‘Look, I had it, I’m good to go, I don’t need to get vaccinated,” he told CNN’s Chris Cuomo. “Not the case. You still need to vaccinated and this is precisely why.”

Fauci emphasized the importance of getting vaccinated to prevent severe and potentially fatal illness that may require hospitalization.

“Even though there is a diminished protection against the variants, there’s enough protection to prevent you from getting serious disease, including hospitalization and deaths,” Fauci said. “So, vaccination is critical.”

Another health expert said the United States should waste no time vaccinating Americans before those variants that are more transmissible overwhelm the country.

“Right now we are in an absolute race against time with these variants, with trying to get people vaccinated before they spread too much across our country, said emergency physician Dr. Megan Ranney, director of the Brown-Lifespan Center for Digital Health in Rhode Island. “It means that just going to the grocery store, to school or to work could become more dangerous. We have an already overtaxed and exhausted health care system.”
The US just suffered its deadliest month of the entire pandemic, with more than 95,300 Covid-19 deaths in January. That’s an average of more than 3,070 deaths a day.
The better news: New Covid-19 case numbers are decreasing in most states. And for the first time in almost two months, Covid-19 hospitalizations finally dipped below 100,000 after a catastrophic post-holiday surge.

Despite the falling numbers, Ranney said now is not the time to let up on the basic precautions such as wearing masks, avoiding unmasked gatherings indoors, hand washing and social distancing.

“We have a little breathing room right now,” she said. “But if these new variants become dominant in our country, we are going to be right back where we were in November and December — and perhaps even worse.”

US efforts to ramp up coronavirus sequencing to identify concerning strains have jumped in recent weeks, but still aren’t at the level they need to be, said Dr. Rochelle Walensky, director of the US Centers for Disease Control and Prevention.

Speaking at a news briefing Monday, Walensky said the United States is on track to sequence at least 7,000 samples weekly. Experts have previously told CNN that the United States should aim to sequence 5% to 10% of cases. Based on cases from the past seven days, this would amount to roughly 52,000 to 104,000 sequences a week.

“The recent rise in number of variants detected in the United States is likely due at least in part to our expanded ability to sequence virus samples,” Walensky noted.

Mask mandate on public transportation set for Monday night

A new order by the CDC requiring people to wear masks while riding any kind of public transportation will go into effect at 11:59 p.m. Monday.

Airlines and airports will be required to report passengers who disobey the new federal mask mandate to federal authorities, according to documents obtained by CNN.

The directive says failure to comply with the mask rules at an airport “may result in the removal and denial of re-entry” of violators.

The CDC said public transportation operators must use best efforts to enforce the mandate, such as allowing only those wearing masks to board and disembarking passengers who refuse to comply.

The order was signed by Dr. Martin Cetron, director of the CDC’s Division of Global Migration and Quarantine.

People can take their masks off briefly to eat, drink or take medication; verify their identity to law enforcement or transportation officials; communicate with hearing impaired people; don an oxygen mask on an aircraft; or during a medical emergency, the CDC said.

Children younger than 2 or people with a disability who cannot wear a mask are exempt.

The debate over how to vaccinate

About 26 million people have received at least one dose of their two-dose vaccines, according to the CDC. About 6 million people have been fully vaccinated with both doses. That’s 1.7% of the US population.

The storm that is dumping snow across the Northeast is delaying vaccinations there. State-run mass vaccination sites in New York and New Jersey are set to be closed Tuesday due to the winter storm. In Massachusetts, the state Department of Transportation is coordinating with several Covid-19 vaccination sites to “keep them as accessible as possible for as long as possible,” Gov. Charlie Baker said.

But with new variants spreading, some health experts say the US should go ahead and give first doses to as many people as possible — even if that might delay second doses for some.

“We still want to get two doses in everyone,” Dr. Michael Osterholm, director of the University of Minnesota’s Center for Infectious Disease Research and Policy, told NBC on Sunday.

“But I think right now, in advance of this surge, we need to get as many one doses in as many people over 65 as we possibly can to reduce serious illness and deaths that are going to occur over the next weeks ahead.”

Osterholm said he’s worried about a potential surge caused by the highly contagious B.1.1.7 strain, first identified in the UK. That strain has now spread to at least 32 states, according to the CDC.

“The surge that is likely to occur with this new variant from England is going to happen in the next six to 14 weeks,” Osterholm said. “And if we see that happen … we are going to see something like we have not yet seen in this country.”

But some health experts are concerned second doses could be delayed. Recipients of the Pfizer/BioNTech vaccine are supposed to get their second doses 21 days after the first dose, and Moderna vaccine doses are supposed to be spaced 28 days apart.

The World Health Organization, Pfizer and Moderna have all said people can wait as long as six weeks between doses. But Pfizer and Moderna said they don’t have any data on how long people can wait between doses and still get good protection.
While Osterholm’s idea is “admirable, trying to give at least some protection to as many people as possible,” it also has drawbacks, said William Haseltine, president of ACCESS Health International.

“First, they may not get fully protected, and that might accelerate the rate of variants taking over and causing us much more trouble in the future,” said Haseltine, a former professor at Harvard Medical School. “Secondly, we really don’t know if delaying the second dose for a long time is going to give you the same degree of protection.”

Ideally, people should stick to the recommended interval of either three weeks or four weeks, said Fauci, also the director of the National Institute of Allergy and Infectious Diseases.

“But if someone who, for one reason or another, is a bit late by a couple of weeks … there is some wiggle room,” Fauci said. “It’s not the end of the world if you delay a little bit. If you want to delay it by six months, that’s different.”

States should not be holding back doses to give people their second shot, Fauci said.

“The first priority will always be to get the people who have gotten their first doses to get their second doses,” Fauci said.

But “a dose that’s available is going to go into someone’s arm. If a person is ready for their second dose, that person will be prioritized.”

Ranney said she hopes increased production can help ensure people can get their second doses in a timely manner.

“We should count on Pfizer and Moderna and hopefully soon Johnson & Johnson as well to help fill that gap,” she said.

“Give everyone the doses that you can right now and count on that increased production so that you can get people adequately protected.”

Racial disparities in vaccinations

New York officials acknowledged Monday there’s a clear racial disparity among the people who have received vaccine doses to date and the city needs to redouble its efforts to address inequitable access.
A new CDC report released Monday highlighted that issue. People in the United States who have received at least one dose of the Covid-19 vaccine were most likely to be female, non-Hispanic White and at least 50 years old, according to the report.

The CDC collected demographic data from states and other jurisdictions on people who began the vaccination process between December 14 and January 14.

Age and gender were identified for nearly all 12.5 million individuals who received at least one dose of Covid-19 vaccine in the first month of distribution. Of those, about 63% were female and about 55% were at least 50 years old.

Race and ethnicity, however, were unknown for about half of the individuals vaccinated. Six jurisdictions did not report any race or ethnicity data.

But of those for whom race and ethnicity were identified, about 60% were non-Hispanic White. About 11.5% were Hispanic or Latino, 6% Asian, 5.4% Black, 2% American Indian or Alaskan Native, and less than 1% Native Hawaiian or Pacific Islander.

The demographic data of those vaccinated against Covid-19 likely reflects the demographics of the people in the Phase 1a priority group, including health care personnel and long-term care facility residents, according to the CDC.

Black and Hispanic people have been found to have more severe outcomes from Covid-19, according to CDC, and “more complete reporting of race and ethnicity data” is needed to detect and respond to potential disparities in Covid-19 vaccination.

Johnson & Johnson may have millions of doses soon

Many Americans hope Johnson & Johnson’s Covid-19 vaccine will get emergency use authorization from the Food and Drug Administration this month.

That vaccine has been shown to be 66% effective in preventing moderate and severe disease in a global Phase 3 trial and 85% effective against severe disease, the company announced Friday. The vaccine was 72% effective against moderate and severe disease in the US.

There are two key advantages to the Johnson & Johnson vaccine. It requires only one dose, and it can be kept at normal refrigeration temperatures.

If the vaccine gets a green light from the FDA in the coming weeks, Johnson & Johnson said it would have fewer than 10 million vaccine doses available, a federal health official told CNN.

The number of doses available would be in the single-digit millions and that number would ramp up to 20 or 30 million doses by April, the official said. CNN has reached out to Johnson & Johnson for comment.

The US government is working with the Australian company Ellume to provide more of its fully at-home Covid-19 tests to the United States, the Biden administration said Monday.

The company has been ramping up manufacturing and will ship 100,000 test kits per month to the US from February through July, said Andy Slavitt, senior White House adviser for Covid-19 response.

With a new $230 million contract, Ellume will “be able to scale their production to manufacture more than 19 million test kits per month by the end of this year, 8.5 million of which are guaranteed to the US government,” Slavitt said.

The Ellume test can detect Covid-19 with 95% accuracy in about 15 minutes, he said.

CNN’s Kaitlan Collins, Andrea Diaz, Maggie Fox, Deidre McPhillips, Michael Nedelman, Ganesh Setty, Naomi Thomas and Greg Wallace contributed to this report.

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US coronavirus numbers drop, but race against new strains heats up

WASHINGTON (Reuters) — Coronavirus deaths and cases per day in the U.S. dropped markedly over the past couple of weeks but are still running at alarmingly high levels, and the effort to snuff out COVID-19 is becoming an ever more urgent race between the vaccine and the mutating virus.

The government’s top infectious-disease expert, Dr. Anthony Fauci, said the improvement in numbers around the country appears to reflect a “natural peaking and then plateauing” after a holiday surge, rather than the arrival of the vaccine in mid-December.

The U.S. is recording just under 3,100 deaths a day on average, down from more than 3,350 less than two weeks ago. New cases are averaging about 170,000 a day after peaking at almost 250,000 on Jan. 11. The number of hospitalized COVID-19 patients has fallen to about 110,000 from a high of 132,000 on Jan. 7.

States that have been hot spots in recent weeks such as California and Arizona have shown similar improvements during the same period.

On Monday, California lifted regional stay-at-home orders in favor of county-by-county restrictions and ended a 10 p.m. curfew. The shift will allow restaurants and churches to resume outdoor operations and hair and nail salons to reopen in many places, though local officials could maintain stricter rules.

Elsewhere, Minnesota school districts have begun bringing elementary students back for in-person learning. Chicago’s school system, the nation’s third-largest district, had hoped to bring teachers back Monday to prepare for students to return next month, but the teachers union has refused. Illinois announced that that more counties will be able to offer limited indoor dining.

“I don’t think the dynamics of what we’re seeing now with the plateauing is significantly influenced yet — it will be soon — but yet by the vaccine. I just think it’s the natural course of plateauing,” Fauci told NBC’s “Today.”

Ali Mokdad, a professor of health metrics sciences at the University of Washington, said that a predicted holiday surge was reduced by people traveling less than expected, and an increase in mask wearing in response to spikes in infections has since helped bring the numbers down.

Caitlin Rivers, an epidemiologist at the Johns Hopkins Center for Health Security, said too few people have been vaccinated so far for that to have had a significant impact on virus trends. She said she can’t predict how long it will take for the vaccines’ effects to be reflected in the numbers.

Rivers said she is concerned that the more contagious variants of the virus could lead to a deadly resurgence later this year.

“I think we were on track to have a good — or a better, at least — spring and summer, and I’m worried that the variants might be throwing us a curveball,” she said.

Nationwide, about 18 million people, or less than 6% of the U.S. population, have received at least one dose of vaccine, including about 3 million who have gotten the second shot, according to the Centers for Disease Control and Prevention. Only slightly more than half of the 41 million doses distributed to the states by the federal government have been injected into arms, by the CDC’s count.

The virus has killed over 419,000 Americans and infected more than 25 million, with a widely cited University of Washington model projecting the death toll will reach about 569,000 by May 1.

And health experts have warned that the more contagious and possibly more deadly variant sweeping through Britain will probably become the dominant source of infection in the U.S. by March. It has been reported in over 20 states so far. Another mutant version is circulating in South Africa.

The more the virus spreads, the more opportunities it has to mutate. The fear is that it will ultimately render the vaccines ineffective.

To guard against the new variants, President Joe Biden on Monday added South Africa to the list of more than two dozen countries whose residents are subject to coronavirus-related limits on entering the U.S.

Most non-U.S. citizens who have been to Brazil, Ireland, Britain and other European nations will be barred from entering the U.S. under the rules re-imposed by Biden after President Donald Trump had moved to relax them.

Fauci said scientists are already preparing to adjust COVID-19 vaccines to fight the mutated versions.

He said there is “a very slight, modest diminution” of the effectiveness of COVID-19 vaccines against those variants, but “there’s enough cushion with the vaccines that we have that we still consider them to be effective” against both.

Moderna, the maker of one of the two vaccines being used in the U.S., announced on Monday that it is beginning to test a possible booster dose against the South African variant. Moderna CEO Stephane Bancel said the move was out of “an abundance of caution” after preliminary lab tests suggested its shot produced a weaker immune response to that variant.

The vaccine rollout in the U.S. has been marked by disarray and confusion, with states complaining in recent days about shortages and inadequate deliveries that have forced them to cancel mass vaccination events and tens of thousands of appointments.

New York Mayor Bill de Blasio said shortages are preventing the city from opening more large-scale vaccination sites.

“Here you have New York City ready to vaccinate at the rate of a half-million New Yorkers a week, but we don’t have the vaccine to go with it,” de Blasio said. “A lot of other places in the country are ready to do so much more.”

Associated Press writers around the U.S. contributed to this report.

Find AP’s full coverage of the coronavirus pandemic at https://apnews.com/hub/coronavirus-pandemic

Copyright © 2021 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.

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2 in 5 Americans live where COVID-19 strains hospital ICUs

Straining to handle record numbers of COVID-19 patients, hundreds of the nation’s intensive care units are running out of space and supplies and competing to hire temporary traveling nurses at soaring rates. Many of the facilities are clustered in the South and West.

An Associated Press analysis of federal hospital data shows that since November, the share of U.S. hospitals nearing the breaking point has doubled. More than 40% of Americans now live in areas running out of ICU space, with only 15% of beds still available.

Intensive care units are the final defense for the sickest of the sick, patients who are nearly suffocating or facing organ failure. Nurses who work in the most stressed ICUs, changing IV bags and monitoring patients on breathing machines, are exhausted.

“You can’t push great people forever. Right? I mean, it just isn’t possible,” said Houston Methodist CEO Dr. Marc Boom, who is among many hospital leaders hoping that the numbers of critically ill COVID-19 patients have begun to plateau. Worryingly, there’s an average of 20,000 new cases a day in Texas, which has the third-highest death count in the country and more than 13,000 people hospitalized with COVID-19-related symptoms.

According to data through Thursday from the COVID Tracking Project, hospitalizations are still high in the West and the South, with over 80,000 current COVID-19 hospital patients in those regions. The number of cases reported in the U.S. since the pandemic’s start surpassed 25 million on Sunday, according to Johns Hopkins University.

Encouragingly, hospitalizations appear to have either plateaued or are trending downward across all regions. It’s unclear whether the easing will continue with more contagious versions of the virus arising and snags in the rollout of vaccines.

In New Mexico, one surging hospital system brought in 300 temporary nurses from outside the state, at a cost of millions of dollars, to deal with overflowing ICU patients, who were treated in converted procedure rooms and surgery suites.

“It’s been horrid,” said Dr. Jason Mitchell, chief medical officer for Presbyterian Healthcare Services in Albuquerque. He’s comforted that the hospital never activated its plan for rationing lifesaving care, which would have required a triage team to rank patients with numerical scores based on who was least likely to survive.

“It’s a relief that we never had to actually do it,” Mitchell said. “It sounds scary because it is scary.”

In Los Angeles, Cedars-Sinai Medical Center ran into shortages of take-home oxygen tanks, which meant some patients who could otherwise go home were kept longer, taking up needed beds. But the biggest problem is competing with other hospitals for traveling nurses.

“Initially, when the COVID surges were hitting one part of the country at a time, traveling nurses were able to go to areas more severely affected. Now with almost the entire country surging at the same time,” hospitals are paying twice and three times what they would normally pay for temporary, traveling nurses, said Dr. Jeff Smith, the hospital’s chief operating officer.

Houston Methodist Hospital recently paid $8,000 retention bonuses to keep staff nurses from signing up with agencies that would send them to other hot spots. Pay for traveling nurses can reach $6,000 per week, an enticement that can benefit a nurse but can seem like poaching to the hospital executives who watch nurses leave.

“There’s a lot of these agencies that are out there charging absolutely ridiculous sums of money to get ICU nurses in,” Boom said. “They go to California, which is in the midst of a surge, but they poach some ICU nurses there, send them to Texas, where they charge inordinate amounts to fill in gaps in Texas, many of which are created because nurses in Texas went to Florida or back to California.”

Space is another problem. Augusta University Medical Center in Augusta, Georgia, is treating adult ICU patients, under age 30, in the children’s hospital. Recovery rooms now have ICU patients, and, if things get worse, other areas — operating rooms and endoscopy centers — will be the next areas converted for critical care.

To prevent rural hospitals from sending more patients to Augusta, the hospital is using telemedicine to help manage those patients for as long as possible in their local hospitals.

“It is a model I believe will not only survive the pandemic but will flourish post pandemic,” said Dr. Phillip Coule, the Augusta hospital’s chief medical officer.

Hospitals are pleading with their communities to wear masks and limit gatherings.

“There just hasn’t been a lot of respect for the illness, which is disappointing,” said Dr. William Smith, chief medical officer for Cullman Regional Medical Center in Cullman, Alabama. He sees that changing now with more people personally knowing someone who has died.

“It has taken a lot of people,” he said of the virus, adding that the death toll — 144 people in six months in a county of 84,000 — “has opened their eyes to the randomness of this.”

The Alabama hospital’s ICU has been overflowing for six weeks, with 16 virus patients on ventilators in a hospital that a year ago had only 10 of the breathing machines. “You can see the stress in people’s faces and in their body language. It’s just a lot for people to carry around,” Smith said.

“Just the fatigue of our staff can affect quality of care. I’ve been encouraged we’ve been able to keep the quality of care high,” Smith said. “You feel like you are in a very precarious situation where errors could occur, but thankfully we’ve managed to stay on top of things.”

Hospitals say they are upholding high standards for patient care, but experts say surges compromise many normal medical practices. Overwhelmed hospitals might be forced to mobilize makeshift ICUs and staff them with personnel without any experience in critical care. They might run out of sedatives, antibiotics, IVs or other supplies they rely on to keep patients calm and comfortable while on ventilators.

“It’s really daunting and mentally taxing. You’re doing what you believe to be best practice,” said Kiersten Henry, a nurse at MedStar Montgomery Medical Center in Olney, Maryland, and a board director for the American Association of Critical-Care Nurses.

In Oklahoma City, OU Medicine Chief Medical Officer Dr. Cameron Mantor said while the vaccines hold promise, hope still seems dim as ICU cases keep mounting. The number of COVID-19 hospitalizations at OU Medicine has declined from more than 100 daily in recent weeks to 98 on Wednesday, Mantor said.

“What is stressing everybody out,” Mantor said, “is looking at week after week after week, the spigot is not being turned off, not knowing there is a break, not seeing the proverbial light at the end of the tunnel.”

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Associated Press writers Marion Renault in Rochester, Minnesota, Nomaan Merchant in Houston and Ken Miller in Oklahoma City contributed.

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The Associated Press Health and Science Department receives support from the Howard Hughes Medical Institute’s Department of Science Education. The AP is solely responsible for all content.

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