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What you can and can’t do after getting the Covid vaccine, according


Even after being fully inoculated against Covid, some public health precautions are still needed until more data on the vaccines can be collected, Dr. Kavita Patel told CNBC on Friday.

It’s well understood the two-shot vaccines from Pfizer and Moderna are highly effective at preventing severe disease and death from Covid-19, Patel said in a “Squawk Box” interview. Less understood right now is how well the vaccines reduce transmission of the coronavirus.

In other words, someone who has been vaccinated has sharply reduced their risk of getting really sick from the coronavirus, but Patel contended precautions are still needed in the coming months if a small group is gathering and a person in that group has not been vaccinated.

“If you are in a household with small children [who don’t yet qualify for the vaccine] or even children with a heightened risk … or even yourself if you are at heightened risk despite being vaccinated, you should consider taking precautions when indoors, wearing masks. Stay outdoors with people if possible,” said Patel, a primary care physician in Washington and nonresident fellow at the Brookings Institution.

“The only reason I say that is because we do need more data to understand what this transmission risk is,” she added.

The Centers for Disease Control and Prevention this week adjusted its quarantine guidelines for people who have been fully vaccinated; both Pfizer and Moderna’s vaccines require two doses for full protection. The CDC now says within three months of being fully vaccinated, people who are exposed to the coronavirus do not need to quarantine if they do not develop symptoms.

Like Patel, the CDC acknowledges the risk of a vaccinated person transmitting the virus to someone else is “uncertain.” But the reason for its modified quarantine guidance, the CDC said, is due to the vaccines showing strong effectiveness at preventing people from developing symptomatic Covid.

That’s important because people who have Covid symptoms are believed to transmit the virus more than asymptomatic individuals, according to the CDC. For that reason, the CDC said a fully vaccinated person who isn’t showing symptoms doesn’t need to quarantine.

The CDC defines full vaccination as two weeks after receiving the second shot of a two-dose vaccine or two weeks after getting a single-shot vaccine. Johnson & Johnson has applied for emergency use authorization for its single-dose vaccine, and an advisory panel is set to consider it at a meeting later this month.

Patel said she believes CDC quarantine guidance could be updated again as more Americans are vaccinated. But at this phase of the pandemic, she said the U.S. finds itself at an “in between period.” Even though she said roughly one in three Americans have either been vaccinated or developed natural coronavirus antibodies due to prior infection, “we still have enough opportunity in the other two people to promote the spread of the virus, particularly a concern with these more transmissible…



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