The CDC has reported 5800 breakthrough cases of COVID-19 out of the nearly 77 million people who have been fully vaccinated. 65 percent of the cases were in women, and just over 40 percent were in people ages 60 and up. About 29% of those experiencing breakthrough infections experienced no symptoms, however, seven percent of people were hospitalized, and 74 people died.
It is unclear why asymptomatic individuals were tested for Covid-19 after being fully vaccinated. It could be that some employers, such as health care systems, require regular testing.
People are considered fully vaccinated two weeks after they receive their second dose of a two-dose vaccine, such as the Pfizer-BioNTech or the Moderna vaccines, or two weeks after a single dose of the Johnson & Johnson vaccine. (Use of the Johnson & Johnson vaccine is currently paused in the U.S. as federal health officials investigate cases of rare blood clots linked to the shots.) In clinical trials, the Pfizer and the Moderna vaccines were found to be around 95 percent effective against Covid-19, and the Johnson & Johnson vaccine was 72 percent effective against moderate-to-severe illness in its U.S. trial.
“I would encourage people to continue, once they’re vaccinated, to use all the prevention measures that we’ve been talking about when they’re outside their home, including masking and distancing and whatnot. And all of that should be active in the workplace,” the CDC’s director, Dr. Rochelle Walensky, said during a briefing for the press on April 12, 2021. These breakthrough cases are another reason that people should continue to wear masks, social distance and wash hands since research is not yet in on weather they could pass the disease on to others.
Vaccination remains critical to ending the pandemic. “It does not reduce the risk to nil, but it does reduce the risk to something that we can handle.”