The jury is still out on whether widespread boosters will be necessary to keep hospital beds open
Covid-19 vaccines offer better defences against hospitalisation and death than versus transmission. However, their protection against infection may have begun to wane. In Iceland and Israel, most adults got jabs months ago, but cases are soaring.
Led by Koen Pouwels of Oxford, the study, released on August 19th, uses a survey of 500,000 people in Britain who were tested regularly for covid-19. After adjusting for age and time since vaccination, it compared the jabs’ efficacy during two time periods: one dominated by the Alpha variant, and another by Delta. For cases with a high viral load, the efficacy of Pfizer’s jab fell from 94% against Alpha to 84% versus Delta.
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