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Why Vaccines Are Essential to Herd Immunity

An infectious disease like coronavirus, if left unchecked, can spread rapidly through a community. Scientists use the transmission rate, or R0 number, to denote how many people a typical carrier of a…

An infectious disease like coronavirus, if left unchecked, can spread rapidly through a community. Scientists use the transmission rate, or R0 number, to denote how many people a typical carrier of a…
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