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Early information trace at an increase in breakthrough infections within the U.S.

Early data hint at a rise in breakthrough infections in the U.S.

Ever since Americans started rolling up their sleeves on coronavirus vaccines, health officials have said that people who are vaccinated are very unlikely to become infected or suffer from serious illness or death. However, preliminary data from seven states suggest that the arrival of the Delta variant in July may have changed the calculation.

Breakthrough infections in vaccinated individuals accounted for at least one in five newly diagnosed cases in six of these states and higher percentages of total hospital admissions and deaths than previously seen in any of them, according to figures compiled by the New York Times.

However, the absolute numbers remain very low and there is no doubt that the vaccines continue to provide effective protection. This is still “a pandemic of the unvaccinated”, as the federal health authorities have often said.

Still, the trend marks a change in how vaccinated Americans rate their risks.

“Remember when the early vaccine studies came out, it was like no one was hospitalized, no one died,” said Dr. Robert Wachter, chairman of the medical school at the University of California at San Francisco. “That is clearly not true.”

The numbers support the belief, widely held by Biden government officials, that some Americans could benefit from booster vaccinations in the coming months. Federal officials plan to approve additional shots as early as mid-September, though it’s not clear who will receive them.

“If the chances of a breakthrough infection have increased significantly, and I think the evidence is clear and the protection against serious illnesses is no longer as robust as it used to be, I think the case for boosters is rising quite a bit.” Fast, ” said Dr. Guardian.

The seven states – California, Colorado, Massachusetts, Oregon, Utah, Vermont, and Virginia – were examined because they have the most detailed data. It is not certain that the trends in these states apply to the entire United States.

In any case, scientists have always expected that the number of people who have been vaccinated will become more and more represented in the census of the seriously ill and the dead as the population grows.

“We don’t want to water down the message that the vaccine is hugely effective and protective, more than we initially hoped,” said Dr. Scott Dryden-Peterson, an infectious disease physician and epidemiologist at Brigham & Women’s Hospital in Boston.

“The fact that we are seeing groundbreaking cases and groundbreaking hospital admissions and deaths doesn’t detract from the fact that it still saves many people’s lives.”

The CDC declined to comment on the states’ numbers. The agency is expected to hold a press conference on Wednesday to discuss breakthrough infections, hospital admissions and vaccine effectiveness.

Most breakthrough infection analyzes have numbers collected through the end of June. Based on the cumulative numbers, the CDC and public health experts concluded that breakthrough infections are extremely rare and that vaccinated people are most unlikely to get seriously ill.

State data shows that vaccinated people are much less likely to get seriously ill or die of Covid-19.

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Can the Vaccinated Develop Lengthy Covid After a Breakthrough An infection?

Can the Vaccinated Develop Long Covid After a Breakthrough Infection?

While some breakthrough cases in people fully vaccinated against Covid-19 are inevitable, they are unlikely to result in hospitalization or death. But an important question about breakthrough infection remains unanswered: Can the vaccinated develop a so-called long covid?

Long Covid refers to a range of symptoms – such as severe fatigue, brain fog, headache, muscle aches, and trouble sleeping – that can last for weeks or months after the active infection has ended. The syndrome is little known, but studies suggest that between 10 and 30 percent of adults who contract the virus can have Covid for a long time, including those who had mild illness or no symptoms at all.

But the vast majority of the long-term data collected by Covid concerns the unvaccinated population. The risk of developing long-term Covid has not been studied in fully vaccinated people who become infected after vaccination.

While preliminary research suggests that it is indeed possible that a breakthrough case could lead to symptoms that could last weeks to months, there are still more questions than answers. What percentage of breakthrough cases result in persistent symptoms? How many of these people are recovering? Are the persistent symptoms after a breakthrough infection as severe as with the unvaccinated?

“I just don’t think there’s enough data,” said Dr. Zijian Chen, medical director of the Center for Post-Covid Care at Mount Sinai Health System in New York. “It’s too early to say that. The number of people who get sick after vaccination is not that high right now, and there is no good tracking mechanism for these patients. “

A study of Israeli health workers recently published in the New England Journal of Medicine offers insight into the risk of long-term Covid infection after a breakthrough infection. Of 1,497 fully vaccinated health care workers, 39 – approximately 2.6 percent – developed breakthrough infections. (All workers were thought to be infected after contact with an unvaccinated person, and the study was conducted before the delta variant became dominant.)

While most breakthrough cases were mild or asymptomatic, seven out of 36 workers observed after six weeks (19 percent) still had persistent symptoms. These long Covid symptoms included a mixture of persistent loss of smell, persistent cough, fatigue, weakness, shortness of breath, or muscle pain.

However, the study’s authors caution against drawing too many conclusions from the research. The sample size – only seven patients – is small. And the research is designed to look at antibody levels in those infected, said Dr. Gili Regev-Yochay, Director of the Department of Epidemiology of Infectious Diseases at Sheba Medical Center. It was not designed to study the risk of long-term Covid illness after a breakthrough infection.

“That was not the scope of this paper,” said Dr. Regev-Yochay. “I don’t think we have an answer to that.”

Still, the fact that one in five healthcare workers who had a breakthrough infection still had persistent symptoms after six weeks seems to be the first clue from a peer-reviewed study that long Covid is possible after a breakthrough infection.

Updated

Aug 16, 2021, 1:10 p.m. ET

“People said to me, ‘You are fully vaccinated. Why are you so careful? ‘”Said Dr. Robert M. Wachter, professor and chair of the medical school at the University of California at San Francisco. “I’m still in the camp that I don’t want to get Covid. I don’t want to get a breakthrough infection. “

Dr. Wachter said that despite the many limitations of the Israeli study, the data provides more evidence that those vaccinated should continue to take reasonable precautions to avoid the virus.

“I’ll take it at face value that one in five people continued to feel bad six weeks after a breakthrough,” said Dr. Guardian. “That’s enough to wear two masks when you go shopping in the supermarket, which isn’t that stressful anyway.”

Understand the state of vaccination and masking requirements in the United States

    • Mask rules. The Centers for Disease Control and Prevention in July recommended that all Americans, regardless of vaccination status, wear masks in public places indoors in areas with outbreaks, reversing the guidelines offered in May. See where the CDC guidelines would apply and where states have implemented their own mask guidelines. The battle over masks is controversial in some states, with some local leaders defying state bans.
    • Vaccination regulations. . . and B.Factories. Private companies are increasingly demanding coronavirus vaccines for employees with different approaches. Such mandates are legally permissible and have been confirmed in legal challenges.
    • College and Universities. More than 400 colleges and universities require a vaccination against Covid-19. Almost all of them are in states that voted for President Biden.
    • schools. On August 11, California announced that teachers and staff at both public and private schools would have to get vaccinated or have regular tests, the first state in the nation to do so. A survey published in August found that many American parents of school-age children are against mandatory vaccines for students but are more likely to support masking requirements for students, teachers and staff who are not vaccinated.
    • Hospitals and medical centers. Many hospitals and large health systems require their employees to have a Covid-19 vaccine, due to rising case numbers due to the Delta variant and persistently low vaccination rates in their communities, even within their workforce.
    • new York. On August 3, New York City Mayor Bill de Blasio announced that workers and customers would be required to provide proof of vaccination when dining indoors, gyms, performances, and other indoor situations. City hospital staff must also be vaccinated or have weekly tests. Similar rules apply to employees in New York State.
    • At the federal level. The Pentagon announced that it would make coronavirus vaccinations compulsory for the country’s 1.3 million active soldiers “by mid-September at the latest. President Biden announced that all civil federal employees would need to be vaccinated against the coronavirus or undergo regular tests, social distancing, mask requirements and travel restrictions.

Making breakthrough infection research difficult is the fact that the U.S. Centers for Disease Control and Prevention only track post-vaccination infections that result in hospitalization or death. While the CDC continues to study breakthrough infections in several large cohorts, the lack of data on all breakthrough cases remains a source of frustration among scientists and patient organizations.

“It is very frustrating not to have data at this point in the pandemic to know what will happen to breakthrough cases,” said Akiko Iwasaki, an immunologist at Yale School of Medicine who conducts studies on long-term Covid. “When a mild breakthrough infection turns into a long Covid, we don’t have that number under control.”

Diana Berrent, founder of Survivor Corps, a Facebook group for people affected by Covid-19 with approximately 171,000 members, conducted an informal survey and found 24 people who said they had persistent symptoms after a breakthrough infection. It is not a scientific sample and the cases have not been validated, but the survey shows that more data is needed on breakthrough cases, Ms Berrent said.

“You can’t extrapolate it to the general population, but it sends a very strong signal that the CDC must mandate coverage of every breakthrough case,” Ms. Berrent said. “We can’t know what we’re not counting.”

However, some experts predict that the surge in new cases caused by the spread of the Delta variant will unfortunately lead to more groundbreaking cases in the coming months. Dr. Chen of Mount Sinai said it would take several months to enroll patients with long covid due to a breakthrough infection.

“We are waiting for these patients to show up at our door,” said Dr. Chen.

Despite the lack of data, one thing is clear: vaccination reduces the risk of getting infected and developing Covid, Athena Akrami, a neuroscientist at University College London, said the data from nearly 4,000 long-term Covid patients developed after long Covid collected and released after a battle with Covid-19 in March 2020.

“It’s simple math,” said Dr. Akrami. “If you reduce infections, the likelihood of long-term Covid illnesses automatically decreases.”

Categories
Health

Can the Vaccinated Develop Lengthy Covid After a Breakthrough An infection?

Can the Vaccinated Develop Long Covid After a Breakthrough Infection?

While some breakthrough cases in people fully vaccinated against Covid-19 are inevitable, they are unlikely to result in hospitalization or death. But an important question about breakthrough infection remains unanswered: Can the vaccinated develop a so-called long covid?

Long Covid refers to a range of symptoms – such as severe fatigue, brain fog, headache, muscle aches, and trouble sleeping – that can last for weeks or months after the active infection has ended. The syndrome is little known, but studies suggest that between 10 and 30 percent of adults who contract the virus can have Covid for a long time, including those who had mild illness or no symptoms at all.

But the vast majority of the long-term data collected by Covid concerns the unvaccinated population. The risk of developing long-term Covid has not been studied in fully vaccinated people who become infected after vaccination.

While preliminary research suggests that it is indeed possible that a breakthrough case could lead to symptoms that could last weeks to months, there are still more questions than answers. What percentage of breakthrough cases result in persistent symptoms? How many of these people are recovering? Are the persistent symptoms after a breakthrough infection as severe as with the unvaccinated?

“I just don’t think there’s enough data,” said Dr. Zijian Chen, medical director of the Center for Post-Covid Care at Mount Sinai Health System in New York. “It’s too early to say that. The number of people who get sick after vaccination is not that high right now, and there is no good tracking mechanism for these patients. “

A study of Israeli health workers recently published in the New England Journal of Medicine offers insight into the risk of long-term Covid infection after a breakthrough infection. Of 1,497 fully vaccinated health care workers, 39 – approximately 2.6 percent – developed breakthrough infections. (All workers were thought to be infected after contact with an unvaccinated person, and the study was conducted before the delta variant became dominant.)

While most breakthrough cases were mild or asymptomatic, seven out of 36 workers observed after six weeks (19 percent) still had persistent symptoms. These long Covid symptoms included a mixture of persistent loss of smell, persistent cough, fatigue, weakness, shortness of breath, or muscle pain.

However, the study’s authors caution against drawing too many conclusions from the research. The sample size – only seven patients – is small. And the research is designed to look at antibody levels in those infected, said Dr. Gili Regev-Yochay, Director of the Department of Epidemiology of Infectious Diseases at Sheba Medical Center. It was not designed to study the risk of long-term Covid illness after a breakthrough infection.

“That was not the scope of this paper,” said Dr. Regev-Yochay. “I don’t think we have an answer to that.”

Still, the fact that one in five healthcare workers who had a breakthrough infection still had persistent symptoms after six weeks seems to be the first clue from a peer-reviewed study that long Covid is possible after a breakthrough infection.

Updated

Aug 16, 2021, 5:01 p.m. ET

“People said to me, ‘You are fully vaccinated. Why are you so careful? ‘”Said Dr. Robert M. Wachter, Professor and Chair of the Medical School, University California San Francisco. “I’m still in the camp that I don’t want to get Covid. I don’t want to get a breakthrough infection. “

Dr. Wachter said that despite the many limitations of the Israeli study, the data provides more evidence that those vaccinated should continue to take reasonable precautions to avoid the virus.

“I’ll take it at face value that one in five people continued to feel bad six weeks after a breakthrough,” said Dr. Guardian. “That’s enough to wear two masks when you go shopping in the supermarket, which isn’t that stressful anyway.”

Understand the state of vaccination and masking requirements in the United States

    • Mask rules. The Centers for Disease Control and Prevention in July recommended that all Americans, regardless of vaccination status, wear masks in public places indoors in areas with outbreaks, reversing the guidelines offered in May. See where the CDC guidelines would apply and where states have implemented their own mask guidelines. The battle over masks is controversial in some states, with some local leaders defying state bans.
    • Vaccination regulations. . . and B.Factories. Private companies are increasingly demanding coronavirus vaccines for employees with different approaches. Such mandates are legally permissible and have been confirmed in legal challenges.
    • College and Universities. More than 400 colleges and universities require a vaccination against Covid-19. Almost all of them are in states that voted for President Biden.
    • schools. On August 11, California announced that teachers and staff at both public and private schools would have to get vaccinated or have regular tests, the first state in the nation to do so. A survey published in August found that many American parents of school-age children are against mandatory vaccines for students but are more likely to support masking requirements for students, teachers and staff who are not vaccinated.
    • Hospitals and medical centers. Many hospitals and large health systems require their employees to have a Covid-19 vaccine, due to rising case numbers due to the Delta variant and persistently low vaccination rates in their communities, even within their workforce.
    • new York. On August 3, New York City Mayor Bill de Blasio announced that workers and customers would be required to provide proof of vaccination when dining indoors, gyms, performances, and other indoor situations. City hospital staff must also be vaccinated or have weekly tests. Similar rules apply to employees in New York State.
    • At the federal level. The Pentagon announced that it would make coronavirus vaccinations compulsory for the country’s 1.3 million active soldiers “by mid-September at the latest. President Biden announced that all civil federal employees would need to be vaccinated against the coronavirus or undergo regular tests, social distancing, mask requirements and travel restrictions.

Making breakthrough infection research difficult is the fact that the U.S. Centers for Disease Control and Prevention only track post-vaccination infections that result in hospitalization or death. While the CDC continues to study breakthrough infections in several large cohorts, the lack of data on all breakthrough cases remains a source of frustration among scientists and patient organizations.

“It is very frustrating not to have data at this point in the pandemic to know what will happen to breakthrough cases,” said Akiko Iwasaki, an immunologist at Yale School of Medicine who conducts studies on long-term Covid. “When a mild breakthrough infection turns into a long Covid, we don’t have that number under control.”

Diana Berrent, founder of Survivor Corps, a Facebook group for people affected by Covid-19 with approximately 171,000 members, conducted an informal survey and found 24 people who said they had persistent symptoms after a breakthrough infection. It is not a scientific sample and the cases have not been validated, but the survey shows that more data is needed on breakthrough cases, Ms Berrent said.

“You can’t extrapolate it to the general population, but it sends a very strong signal that the CDC must mandate coverage of every breakthrough case,” Ms. Berrent said. “We can’t know what we’re not counting.”

However, some experts predict that the surge in new cases caused by the spread of the Delta variant will unfortunately lead to more groundbreaking cases in the coming months. Dr. Chen of Mount Sinai said it would take several months to enroll patients with long covid due to a breakthrough infection.

“We are waiting for these patients to show up at our door,” said Dr. Chen.

Despite the lack of data, one thing is clear: vaccination reduces the risk of getting infected and developing Covid, Athena Akrami, a neuroscientist at University College London, said the data from nearly 4,000 long-term Covid patients developed after long Covid collected and released itself after a March 2020 battle with Covid-19

“It’s simple math,” said Dr. Akrami. “If you reduce infections, the likelihood of long-term Covid illnesses automatically decreases.”

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Health

Covid breakthrough danger could also be a lot decrease with Moderna vaccine than Pfizer

Covid breakthrough risk may be much lower with Moderna vaccine than Pfizer

On this illustration from 19.

Given Ruvic | Reuters

The risk of developing a breakthrough COVID-19 infection with the Delta variant after being fully vaccinated with the Moderna vaccine may be much lower than that, according to a new study from the Mayo Clinic awaiting a full review Risk to those who received the Pfizer vaccine.

The study found that in July in Florida, where COVID cases have hit an all-time high and the Delta variant is widespread, the risk of a breakthrough in Moderna recipients was 60% lower compared to Pfizer recipients.

Similarly, last month in Minnesota, the authors found that the Moderna vaccine (also known as mRNA-1273) was 76% effective in preventing infection, but the Pfizer vaccine (known as BNT162b2) was 42% effective.

“Comparing infection rates between matched individuals fully vaccinated with mRNA-1273 with BNT162b2 at Mayo Clinic Health System sites in several states (Minnesota, Wisconsin, Arizona, Florida, and Iowa) found one with mRNA-1273 Twice the risk reduction compared to a breakthrough infection compared to BNT162b2 “, write the authors in their abstract.

The authors found that both vaccines “strongly protect” against serious illnesses; the difference seems to be more whether people become infected at all. The CDC has said that the risk of infection in the unvaccinated is 8 times higher than that of the vaccinated and the risk of hospitalization or death is 25 times higher.

The so-called pre-print study, which was neither peer-reviewed nor published in a scientific journal, was first published on Sunday but received more attention on Wednesday when Axios reported that the Biden administration was using the data as a “wake-up call.” . “

Pfizer told Axios that it and its partner BioNTech “can develop and produce a bespoke vaccine against this variant in about 100 days of a decision, subject to regulatory approval.”

The company confirmed the effectiveness of its vaccines in a subsequent statement, saying it was also determined to develop boosters.

“Pfizer and BioNTech have put in place a robust refresher research program to ensure that our vaccine continues to offer the highest level of protection possible. Initial data from a third dose of the current vaccine shows that a booster dose at least 6 months after the second dose elicits high neutralization titers against the wild-type, beta and delta variants, “Pfizer said in a statement.

Just last week, Moderna warned that breakthrough infections were on the rise, saying those who received his vaccine would likely need a booster shot before winter. And at the end of last month, Pfizer also said that a booster that is already being tested would be effective against the Delta variant.

Data from New Jersey, where Delta now accounts for 90% of all positive COVID samples tested, underscores the key points: Breakthrough infections still make up a very small percentage of new COVID hospital admissions, but that percentage has been increasing significantly in weeks recently.

Fully vaccinated New Jerseyans accounted for 18.5% of all new COVID cases in the July 20-26, said Governor Phil Murphy. More importantly, these cases accounted for 3% of all new hospital admissions.

Murphy cited the data Monday as evidence that vaccines are working, but the fact that as many as 3% of hospitalized COVID patients have been vaccinated is a concern – and with it the direction in which the breakthrough cases are headed to develop.

The proportion of 3% of vaccinated people who were hospitalized with the virus in the period from July 20 to July 26 has increased significantly compared to the proportion of 0.004% in the period up to July 26.

Pfizer accounts for 30% of the more than 10.6 million vaccine doses given in New Jersey to date, while Moderna accounts for about 21%, state data shows.

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Breakthrough Infections and the Delta Variant: What to Know

What to Know About Breakthrough Infections and the Delta Variant

“Long Covid” is a poorly understood set of symptoms that can plague people for several months after an active infection has ended. While these symptoms eventually go away in many patients, “there is this subset of people who have long had Covid who just cannot recover,” said Akiko Iwasaki, an immunologist at Yale University.

Only a few small studies have looked at how common or how severely Covid can occur after breakthrough infections. It’s likely rare, say some experts, because breakthrough infections are unusual to begin with and of shorter duration.

In a study in Israel, about seven out of 36 people with breakthrough infections had symptoms that lasted more than six weeks. And in a survey of Covid-19 survivors, 24 out of 44 people with a symptomatic breakthrough infection reported persistent problems.

“We really need a broader national or even international survey,” said Dr. Iwasaki.

If you can survive a breakthrough infection relatively unscathed, you will likely get away with more robust protection against variants. Essentially, the infection acts as a booster shot, researchers say, boosting your immune system’s ability to recognize and fight the virus.

Studies have shown that when people recovering from Covid-19 receive even one dose of a vaccine, their antibody levels skyrocket. “I assume similar things would happen if you had a breakthrough infection,” said Dr. Iwasaki.

The vaccines train the immune system to recognize a piece of the original virus, a strategy that could leave us vulnerable to future variants. But any exposure expands the immunity repertoire, said Dr. Mina.

Eventually, through booster vaccinations or through repeated infections, our bodies will gain sufficient training in the virus to face versions with new mutations, he said, adding, “But we’re not there yet.”

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What to Know About Breakthrough Infections and the Delta Variant

What to Know About Breakthrough Infections and the Delta Variant

“Long Covid” is a poorly understood set of symptoms that can plague people for several months after an active infection has ended. While those symptoms eventually resolve in many patients, “there are this subset of people who have long Covid who just aren’t able to recover at all,” said Akiko Iwasaki, an immunologist at Yale University.

Only a couple of small studies have investigated how common or severe long Covid may be after breakthrough infections. It is likely to be rare, Dr. Iwasaki said, because breakthrough infections are uncommon to begin with and shorter in duration.

In one study in Israel, about seven of 36 people with breakthrough infections had persistent symptoms for more than six weeks. And in a survey of Covid-19 survivors, 24 of 44 people with a symptomatic breakthrough infection reported lingering problems.

“We really need a wider national or even international survey,” Dr. Iwasaki said.

If you get through a breakthrough infection relatively unscathed, you are likely to walk away with more robust protection against variants. The infection essentially acts as a booster shot, researchers say, strengthening your immune system’s ability to recognize and fight the virus.

Studies have shown that when people who recover from Covid-19 receive even one dose of a vaccine, their antibody levels skyrocket. “I expect similar things would happen when you have a breakthrough infection,” Dr. Iwasaki said.

The vaccines train the immune system to recognize a piece of the original virus, a strategy that may leave us vulnerable to future variants. But every exposure broadens the repertoire of immunity, Dr. Mina said.

Eventually, through booster shots or through repeated infections, our bodies will gain an education in the virus sufficient to counter versions with new mutations, he said, adding, “But we’re not there yet.”

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Covid delta will result in improve in breakthrough infections: Moderna

Covid delta will lead to increase in breakthrough infections: Moderna

The highly contagious Delta variant will lead to an increase in breakthrough infections in those who are fully vaccinated as people begin to exercise indoors after the summer, Moderna said Thursday.

While Moderna’s two-dose vaccine remains “stable” six months after the second vaccination, immunity to the coronavirus will continue to decline and ultimately reduce the vaccine’s effectiveness, the company said in the slides accompanying its second quarter earnings report were attached.

The company said its vaccine was 93% effective six months after the second dose. By comparison, Pfizer and BioNTech reported that their vaccine effectiveness decreased to about 84% after six months.

“Given this overlap, we believe a dose 3 refresh will likely be needed before the winter season,” wrote Moderna.

Moderna’s warning comes as the Delta variant becomes more widespread in more than 100 countries, including the United States. Delta, the predominant form of the disease in the United States, is more transmissible than the common cold, 1918 Spanish flu, smallpox, Ebola, MERS, and SARS, according to the Centers for Disease Control and Prevention.

A healthcare worker treats a patient in a negative pressure room in the Covid-19 Intensive Care Unit (ICU) at Freeman Hospital West in Joplin, Missouri, Tuesday, August 3, 2021.

Angus seed dressings | Bloomberg | Getty Images

For some Americans, concerns about the effectiveness of the vaccine have grown with the advent of the variant, which can cause more serious illnesses than the original coronavirus. Some people have even gone so far as to look for an extra dose not yet recommended by the CDC. This week, San Francisco health officials announced that they would allow patients who received the Johnson & Johnson vaccine to have a second vaccination from Pfizer-BioNTech or Moderna.

Drug makers have been saying for months that they expect people to need booster shots and perhaps additional doses annually at some point, just like they did with seasonal flu.

Moderna said Thursday that results from a Phase 2 study showed that a booster dose of its vaccine elicited a “robust” antibody response against three variants, including Delta.

The CDC and World Health Organization say booster doses are not currently required due to a lack of data. In fact, on Wednesday the WHO called on wealthy nations to stop distributing Covid booster vaccinations to give the world a chance to meet the WHO’s goal of vaccinating 10% of each country’s population by October.

“We need an urgent turnaround from moving the majority of vaccines to high-income countries and the majority to low-income countries,” said WHO Director-General Tedros Adhanom Ghebreyesus.

The move comes after Israel announced that the country will be giving booster doses to its elderly population. The Dominican Republic has also given its population booster doses, while neighboring Haiti recently secured its first vaccine doses.

People in the US are also finding ways to get booster vaccinations.

– CNBC’s Rich Mendez contributed to this report.

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Delta variant ‘completely’ driving Covid breakthrough circumstances, says physician

Delta variant ‘absolutely’ driving Covid breakthrough cases, says doctor

Professional sports leagues are uniquely positioned to track breakthrough Covid cases because they test thousands of athletes consistently, according to Dr. Robby Sikka, a physician who has worked with numerous NBA and NFL teams.

Sikka told CNBC that the highly transmissible delta variant is “absolutely” driving most of the Covid breakthrough cases he’s studied.

“Delta is driving this,” said Sikka, the founder of Sports Medicine Analytics Research Team, an organization that assists numerous professional sports leagues with injury data.

“We know that the delta variant has a higher viral load, it’s more infectious, it’s more contagious, and it is driving cases in the community. There’s an extremely high viral burden in the community.”

As Covid cases surge nationwide, new research is showing that fully vaccinated people can transmit the virus as asymptomatic carriers. More than 5,900 fully vaccinated Americans have either died or been hospitalized with Covid breakthrough infections through July 19, according to the Centers for Disease Control and Prevention’s most recent data. The website also notes that 1,821 of those cases were either “asymptomatic or not related to Covid-19.”

Sikka told “The News with Shepard Smith” that vaccines do work to prevent severe illness when it comes to Covid and the delta variant, and that a key takeaway from sports is that vaccinated athletes come back sooner than those who are unvaccinated. 

“The athletes that have gotten Covid, despite being vaccinated, by and large, returned and have done well and been able to return and perform at a high level,” said Sikka. 

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Why Vaccinated Folks Are Getting ‘Breakthrough’ Infections

Why Vaccinated People Are Getting ‘Breakthrough’ Infections

Whether a vaccinated person ever becomes infected may depend on how high antibodies spiked after vaccination, how potent those antibodies are against the variant, and whether the level of antibodies in the person’s blood has waned since immunization.

In any case, immune defenses primed by the vaccines should recognize the virus soon after infection and destroy it before significant damage occurs.

“That is what explains why people do get infected and why people don’t get seriously ill,” said Michel C. Nussenzweig, an immunologist at Rockefeller University in New York. “It’s nearly unavoidable, unless you’re going to give people very frequent boosters.”

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Understand the State of Vaccine Mandates in the U.S.

There is limited evidence beyond anecdotal reports to indicate whether breakthrough infections with the Delta variant are more common or more likely to fan out to other people. The C.D.C. has recorded about 5,500 hospitalizations and deaths in vaccinated people, but it is not tracking milder breakthrough infections.

Additional data is emerging from the Covid-19 Sports and Society Workgroup, a coalition of professional sports leagues that is working closely with the C.D.C. Sports teams in the group are testing more than 10,000 people at least daily and sequencing all infections, according to Dr. Robby Sikka, a physician who worked with the N.B.A.’s Minnesota Timberwolves.

Breakthrough infections in the leagues seem to be more common with the Delta variant than with Alpha, the variant first identified in Britain, he said. As would be predicted, the vaccines cut down the severity and duration of illness significantly, with players returning less than two weeks after becoming infected, compared with nearly three weeks earlier in the pandemic.

But while they are infected, the players carry very high amounts of virus for seven to 10 days, compared with two or three days in those infected with Alpha, Dr. Sikka said. Infected players are required to quarantine, so the project has not been able to track whether they spread the virus to others — but it’s likely that they would, he added.