Commentary

The difference between COVID vaccines’ ‘efficacy’ and ‘effectiveness’ explained

Vials of the Oxford-AstraZeneca Covid-19 vaccine are pictured ahead of doses being given to residents at the Belong Wigan care home in Wigan, northwest England, on January 21, 2021. Some British hospitals resemble a "war zone" due to the influx of coronavirus patients in the country's latest wave of the disease, the government's chief scientific adviser said Wednesday. / AFP / Oli SCARFF

 

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