Can Vaccinated People Spread the Virus? We Don’t Know, Scientists Say.

The Center for Disease Control and Prevention on Thursday called its director Drs. Rochelle P. The controversial comments by Valensky retracted, stating that people who are vaccinated against coronoviruses never get infected or pass the virus on to others.

The assertion has questioned the precautions that the agency has taken The people who were vaccinated were urged to take it only last month., Such as wearing masks and gathering with unrelated people in limited circumstances.

“Dr. Valensky spoke broadly during this interview, “an agency spokesman told The Times. “It is possible that some people who have been fully vaccinated may receive Kovid-19. The evidence is not clear whether they can spread the virus to others. We are continuing to evaluate the evidence. “

The agency was responding to criticism from scientists who noted that current research is sufficient to claim that vaccinated people cannot spread the virus.

The data says that “it’s very hard for people infected with vaccination, but don’t think for a second that they can’t get infected,” said Paul DuPreaux, director of the Vaccine Research Center at the University of Pittsburgh.

In a television interview with Rachel Madavo of MSNBC, Dr. Referred to Walensky Data published One dose of the modern or Pfizer-BioNotech vaccine was demonstrated by the CDC to be 80 percent effective in preventing infection, and two doses were 90 percent effective.

This certainly suggests that vaccinated people may be less likely to be infected, but Drs. Valensky’s comments indicated that security was complete. “Our data from the CDC today shows that vaccinated people do not carry the virus, do not get sick,” she said. “And it’s not just in clinical trials, it’s also in real-world data.”

Dr. Valensky also emphasized the importance of continuing to wear masks and maintaining precautions even for those vaccinated. Nevertheless, the brief comment was Widely explained As saying that the vaccine offered Full protection Against infection or transmission.

In an epidemic that routinely produces scientific misunderstandings, experts said they would like Drs. Was sympathetic to Valensky and his clear desire for Americans to be cautious. It was only on Monday that he said the rising caseloads had left him with a sense of “impending doom”.

“If Valensky had said that most vaccinators don’t carry the virus, we wouldn’t discuss it,” said John Moore, a virologist at Weil Cornell Medicine in New York.

“What we know is that vaccines are very effective against infection – there is more and more data on that – but nothing is 100 percent,” he said. “This is an important public health message that needs to be received correctly.”

Some experts said that the misunderstanding could impede the agency’s immediate pleas for vaccination. As of Wednesday, 30 percent of Americans had received at least one dose of the vaccine and 17 percent were completely immunized.

The Director of Health Policy and Outcomes of Memorial Sloan Catering Cancer Center in New York, Drs. Peter Bach said, “Research shows that there can be no daylight between a truly impressive but incomplete security – and how it is described.”

Dr. Bach said, “This makes the government feel that the government is skeptical of science.”

All coronovirus vaccines have been spectacularly successful in preventing severe disease and death from Kovid-19, but how well they prevent infection is less clear.

Clinical trials of vaccines were designed to evaluate only whether vaccines prevent critical illness and death. The CDC’s research on Monday led to a welcome conclusion that the vaccines are highly effective in preventing infection.

The study enrolled 3,950 health care workers, emergency responders, and others at high risk of infection. Participants plagued their noses each week and sent samples for testing, allowing federal researchers to track all infections, symptomatic or not. Two weeks after vaccination, the majority of the vaccinated people remained virus-free, the study found.

Follow-up data from clinical trials support that finding. In the results released on Wednesday by Pfizer and BioNTech, for example, 77 people who received the vaccine had coronovirus infection compared to 850 people who received a placebo.

“Clearly, some vaccinated people get infected,” Drs. DuPreaux said. “We are preventing symptoms, we are keeping people out of hospitals. But we are not making them completely resistant to an infection. “

Experts said that the number of people vaccinated was more likely to be among those receiving vaccines made by Johnson & Johnson and AstraZeneca, with fewer numbers. (Nevertheless, they are worth taking vaccines, as they prevent equally serious illness and death.)

The rate of infection may also be higher in people exposed to a virus variant that can bypass the immune system.

Cases are rising once again across the country, threatening a new upsurge. Dr. A day after Valensky’s remarks, he made an emotional appeal to the American public to exercise caution.

He said, “I am asking you to stay for a while, when you can, to be vaccinated, so that all those people who love us all will still be here.”

Given the increasing numbers, it is especially important that immunized people continue to protect those who have not yet been immunized against the virus, experts said.

Dr. “Vaccinated people should not throw away their masks at this point,” Moore said. “This epidemic is not over.”

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