Breakthrough cases and COVID-19 recovered individuals with one or two doses of vaccine have relatively higher protection against Delta variant in comparison to those administered either one or two doses of Covishield, a study stated. Prior vaccination results in less severe disease against subsequent infection provide
The World Health Organization has said the Delta variant of COVID-19 is now present in nearly 100 countries as per conservative estimates, and warned that in the coming months the highly transmissible strain will become the dominant variant of the coronavirus globally. In its COVID-19
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