How effective are the different vaccines against covid-19 variants?
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How effective are the different vaccines against covid-19 variants?

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By Michael Le Page

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A health worker gives a dose of the CoronaVac vaccine in Anamã, Brazil

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IT SEEMS that every time we think we are turning the tide in the coronavirus pandemic, another new variant emerges. The latest threat is the B.1.617.2 variant that is playing a large role in the terrible outbreak in India and is spreading in many other nations. The big question is, will existing vaccines work well enough to prevent major new outbreaks?

We already know that several vaccines are somewhat less effective at preventing symptomatic infections by new variants. For B.1.617.2, the drop in efficacy appears to …

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