What is the status of a COVID hack, and how big is the risk? : shots

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With new infections on the rise across the country due to the delta variant, reports of breakthrough cases among those who have been fully vaccinated can be alarming. Mario Tama/Getty Images Hide the caption

toggle caption Mario Tama / Getty Images

With new infections on the rise across the country due to the delta variant, reports of breakthrough cases among those who have been fully vaccinated can be alarming.

Mario Tama / Getty Images

There have been a number of recent reports of fully vaccinated people who have tested positive for coronavirus — at the White House, Congress, the Olympics and Major League Baseball. And with the rapidly spreading delta variant leading to increased infections, hospitalizations and deaths, many people are wondering if vaccines are as protective as we thought.

But the current crop of vaccine breakthroughs neither surprises nor alarms public health experts. “I haven’t seen any signs in the United States that they are occurring at levels that we would be concerned about.” [vaccine] The effectiveness is declining, said Saad Omar, director of the Yale Institute for Global Health.

In all of these places, from Capitol Hill to professional sports, nearly everyone is vaccinated, he points out, and people get repeated asymptomatic testing. “It is not surprising that we see a large number of cases in vaccination when the vaccination rate is high,” he said.

However, vaccinated people may rightly ask: Are breakouts becoming more common because of the delta variant? Can I get sick or a family member gets sick?

Here’s what to know about breakouts in the Delta context, and what scientists are doing to track the effectiveness of vaccines:

You can get COVID-19 even if you’ve been vaccinated, but it’s rare and likely mild

Conclusion: do not panic. So far, research shows that current vaccines hold up well against the delta variant. For example, a June study from the United Kingdom found that the Pfizer vaccine was 96% effective against hospitalization of the delta variant after two doses.

If you do get infected (which is unlikely but possible), the vaccine should help you avoid getting seriously ill. “Breather infections, they tend to be mild — they tend to be more like a common cold,” said Dr. Carlos del Rio, professor of medicine and the epidemiology of infectious diseases at Emory University.

“These minor discoveries, according to a New England Journal of Medicine study three weeks ago, were associated with lower viral loads and significantly fewer symptoms,” added Dr. Monica Gandhi, an infectious disease physician at the University of California, San Francisco. In particular, the study showed that “if you get little progress with either alternative, you’ll have a 40% lower viral load in your nose after the vaccination than if you had a natural infection,” she said.

Serious cases among vaccinated people are possible, but extremely rare – vaccines significantly reduce the risk of serious illness leading to hospitalization or death According to Dr. Rochelle Wallinsky, director of the Centers for Disease Control and Prevention, 97% of those who are currently hospitalized Those with COVID-19 are not immune.

For context, as of July 12, of the 159 million fully vaccinated people, the CDC documented 5,492 cases of fully vaccinated people who were hospitalized or died of COVID-19, 75% of whom were over the age of 65. Not It’s clear how many of these paranormal injuries are caused by the delta variant, but this is now the dominant variant in circulation.

The chances of getting seriously ill after a vaccination are higher for those with certain health conditions that affect the immune system. Dr. Mark Baum, president and CEO of Houston Methodist, said that at his hospital, 90% of COVID-19 patients are not immunized. He said that the small percentage of vaccinated patients who end up in the hospital, “have significant underlying health risks — like cancer, like [organ] Transplants — may have prevented them from forming a complete immune response to the vaccine.”

Some argue that asymptomatic breakouts shouldn’t even count

“I think we’re misusing the term hack,” said Dr. Paul Offit, director of the Vaccine Education Center at Children’s Hospital of Philadelphia. “If a fully vaccinated person is later hospitalized or dies of the virus, that’s a breakthrough case.” He said he would not call a “asymptomatic or relatively mild case” a “breakthrough case”.

What matters, he said, is that “the vaccine still does what it was designed to do – keep people out of the hospital and out of the morgue.”

In fact, the CDC doesn’t even recommend routine testing for people who have been vaccinated without symptoms of the coronavirus. As Gandhi of the University of California, San Francisco explained, positive tests may just be picking up “dead viral particles in your nose,” she said. “Vaccinated people may get it in their noses, but they will kill it – and that’s actually what the immune system does.”

The Centers for Disease Control and Prevention can’t track all the hacks, but it does use modeling to estimate risk

There is no set number of hack cases, for several reasons. First of all, there would be no way to count asymptomatic breakouts, because the US doesn’t test nearly enough to catch them all. And in fact, the CDC stopped keeping a running tally of minor breakouts in May.

This isn’t necessarily a problem, said Emily Martin, a professor of epidemiology at the University of Michigan. “You don’t want to test everyone – you don’t need to identify everyone who is positive,” she said. “You just need to understand how the positives you find are the whole pie you don’t see.”

The CDC operates carefully designed surveillance systems (which attempt to find representative circular slices) and burden estimators (the calculations you use to fill the rest of the pie). It’s a process that’s already done every year with influenza, Martin said, to assess how well the flu vaccine works when the vast majority of people who get the flu are never tested.

Now, the CDC is doing the same for COVID-19 monitoring. Hospitals and health departments send the CDC detailed information about specific cases of vaccinated patients who have been hospitalized with COVID-19.

“We would like to get a sample of the virus so we can understand the viral load, so we can sequence it, and we can understand their symptoms and the risks that would potentially put them in this position,” Walinsky of the Centers for Disease Control and Prevention told the Senate Committee on Tuesday.

At the same time, the agency is conducting ongoing vaccine efficacy studies in long-term care facilities, academic medical centers, hospitals, and among health care workers and essential workers. “We do many of these studies across the country,” Walinsky said, explaining that these allow the CDC to get an accurate picture of the true rate of penetration among vaccinated people and whether that changes over time.

“This is a more systematic way of measuring breakouts,” Martin said. Realistically, health officials can’t count every case, so this careful, long-term monitoring, along with calculations to extrapolate those results, gives a fuller picture of how much virus is already in the community.

The number of hacks is increasing, and that’s to be expected

There are basic calculations at play: As more people get vaccinated, even if breakouts are rare, there will be an increasing number of vaccinated cases.

“Even with a vaccine that is 95% effective, you would have one in 20 vaccines at risk of getting sick,” said Dr. Kathleen Newell, director of the Center for Vaccine Development and Global Health at the University of Maryland. The important thing to note is that “the sheer number [of cases] They are among the unvaccinated.”

Certainly, with the delta variant taking over — which spreads about two to three times faster than the original strain — there will be more cases among all, vaccinated and unvaccinated, said John Moore, professor of microbiology and immunology at Weill Cornell Medicine.

“But its ability to infect fully vaccinated people is much lower than that of those who are not,” he said. “In other words, the vaccines are still working, but a little less well.”

Epidemiologist Martin added that there is no clear data yet showing that delta is responsible for the dramatic rise in breakouts in the United States. “We are still watching carefully,” she added.

It is not yet known whether you can spread the coronavirus if you get a hack infection

In general, people who are vaccinated and get infected have fewer viruses. “This lower viral load makes it less likely for you to transmit – not impossible by any means but less likely,” Gandhi said.

Dr. Anthony Fauci, the chief medical advisor on COVID-19 to President Biden and the nation’s top infectious disease expert, told reporters Friday that research on “whether or not transmission is a large study is ongoing,” referring to Prevent COVID U, a study Transmission among approximately 12,000 college students vaccinated with the Moderna vaccine.

Fauci added that while there are no results from that study yet, the low viral load in cases of penetration indicates that “this vaccinated person is less likely to transmit, compared to an unvaccinated person.”

However, with cases rising and the vaccination campaign stagnating, a growing group of health experts are recommending mask use and other mitigation strategies to prevent spread should this occur. “I think the wise thing at this point in time – and what I do personally is, ‘If I’m going to a crowded place, where there are a lot of people, including people that I probably haven’t vaccinated, I’m wearing a mask,'” Emory’s del Rio said.

Vaccines likely reduce the chance of catching COVID-19 for a long time

“We haven’t seen reports yet of hacking cases that have caused the spread of COVID for a long time, thank God,” said Gandhi of the University of California, San Francisco. One reason for this, she said, is that prolonged COVID involves “a very erratic inflammatory response that gets naturally infected.” “What you get infected after you’ve been vaccinated, is what we call a more up-regulated response or adaptive immunity.”

However, virologist Angela Rasmussen of the Vaccines and Infectious Diseases Organization of the University of Saskatchewan in Canada noted that data on this is limited, so we can’t rule it out completely.

“The safest thing to do is to avoid infection completely, which is why I think it’s appropriate for people to use additional mitigation measures,” she said.

In addition to vaccinating, that could mean breaking out masks again, re-scaling up good hand hygiene, and getting more air in when gathering indoors. “The mitigation measures we put in place earlier will still work against the delta variant – not carried over another path,” she added.

NPR’s Alison Aubrey contributed to this report.

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