Efficacy of Covid-19 shots wanes, fueling boosters debate - The Indian Express
A study found that the Pfizer-BioNTech vaccine is about 90% effective at preventing symptomatic infection two weeks after the second dose but drops to 70% effective after five months. However, public health experts say the decline doesn’t mean vaccines aren’t…
As tens of millions of eligible people in the United States consider signing up for a Covid-19 booster shot, a growing body of early global research shows that the vaccines authorized in the United S… [+5175 chars]
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