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Tags Immunity

Tag: immunity

How big a threat is Omicron?

Here are two big questions: How fast can Omicron spread? And how sick will it make you? Understand those and you understand the threat and...

British study shows COVID-19 vaccine efficacy wanes under Delta

 A British public health study has found that protection from either of the two most commonly used COVID-19 vaccines against the now prevalent Delta...

Pfizer says it’s time for a Covid booster; FDA and CDC say not so fast

Drugmaker Pfizer said Thursday it is seeing waning immunity from its coronavirus vaccine and says it is picking up its efforts to develop a...

In boost for COVID-19 battle, Pfizer vaccine found 94% effective in real world

The first big real-world study of the Pfizer/BioNTech vaccine to be independently reviewed shows the shot is highly effective at preventing COVID-19, in a...
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