The study, published on Wednesday by the US Centers for Disease Control and Prevention (CDC), found that as the Delta variant became the dominant coronavirus strain during the second half of 2021, people who were vaccinated were six times less likely to catch Covid-19 than those who hadn’t been jabbed.
However, those who had been infected with an earlier variant of the coronavirus, but hadn’t been vaccinated, were between 15 and 29 times less likely to catch the virus.
A similar difference was noticed in hospitalization rates, with prior immunity conferring better protection against hospitalization than vaccination.
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