An estimated 68% of Americans are fully vaccinated.
Pfizer-BioNTech’s new bivalent Covid-19 vaccine—which targets the original strain and some Omicron subvariants—provides more protection against the virus and its omicron variants than its initial vaccine, according to aA new bivalent Pfizer vaccine is more effective than the original.A booster dose of the Omicron BA.4- and BA.5-adapted Covid-19 vaccine was 11 times more effective against the BA.4.6 subvariant, nearly seven times more effective against the BA.2.75.
“The Covid-19 vaccines, including boosters, continue to save countless lives and prevent the most serious outcomes—hospitalization and death—of Covid-19,” FDA Commissioner Robert Califf said in the FDA’s approval of the bivalent vaccine, according to a
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