Why Vaccines Are Essential to Herd Immunity – The Wall Street Journal

An infectious illness like coronavirus, if left unchecked, can spread rapidly through a community. Scientists utilize the transmission rate, or R0 number, to denote the number of people a normal carrier of a disease might go on to infect. In the absence of control steps such as social distancing or mask wearing, the unique coronavirus has an R0 number of between 2.5 and 3.0, implying the average provider would contaminate between two and three people …

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