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This week, Biden management Booster vaccines are highly recommended for most vaccinated Americans, and the Centers for Disease Control and Prevention has also published three studies that federal officials say provide evidence that booster vaccines from Pfizer-BioNTech and Moderna coronavirus vaccines will be required in the coming months.
Here’s what we know about booster shots—why Americans might need them and when to get them:
Case for a booster shot
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taken together, CDC studies show He said that while vaccines are highly effective against hospitalizations and deaths, the shield they provide against virus transmission has weakened over the past few months.
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Concordance with finding early data from seven statesThe report, collected by The New York Times this week, suggested an increase in breakthrough infections and a smaller increase in hospitalizations among those vaccinated as the Delta variant spread in July.
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Experts said the decrease in efficacy against infection could be due to reduced vaccine immunity, delay in measures such as wearing masks, or the rise of the highly contagious Delta variant, or a combination of the three.
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New studies show that overall, vaccines have an efficacy of roughly 55 percent against all infections, 80 percent against symptomatic infection, and 90 percent or higher against hospitalization, said Boston University epidemiologist Ellie Murray.
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