Infection With Previous COVID Variants Insufficient For Reaching Herd Immunity Against Delta: Study

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Infection With Previous COVID Variants Insufficient For Reaching Herd Immunity Against Delta: Study

source https://news.abplive.com/health/2021-delhi-covid-outbreak-shows-infection-with-prior-variants-insufficient-for-reaching-herd-immunity-against-delta-study-1487918
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