The original vaccine formula has been extensively tested in humans, but the booster including the BA.4 and BA.5 variants has only been tested in mice.
DENVER, Colo. — For the first time since the pandemic began, COVID vaccines are getting an update, and the White House is encouraging all eligible Americans to get the new booster shot.
Pisney is an infectious disease specialist, and she and Dr. Ross Kedl, a professor of immunology at the University of Colorado Anschutz Medical Campus, explained the updated boosters use the original vaccine plus some added proteins to protect against omicron BA.4 and BA.5. “It's not like starting fresh with a new vaccine. Bivalent vaccines have already been tested and we have clinical safety data for previous strains of COVID,” said Pisney.
“If you're a person who gets a flu shot every year, well, then every time you've been getting it over the last three years, it's never, it's never been tested in humans each year,” said Kedl.
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There's no bad time to get a new COVID booster if you're eligible, CDC director saysAmericans will now have access to updated COVID booster shots after the Centers for Disease Control and Prevention signed off on reformulated versions of the Moderna and Pfizer-BioNTech COVID-19 vaccines Thursday night.
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