You probably heard the term of herd immunity used in COVID-19 pandemic. What is herd immunity? It means when most of a population is immune to an infectious disease, it provides indirect protection—or herd immunity—to those who are not immune to the disease. How do we achieve herd immunity? What proportion of population are in need of herd immunity? This video is based on an article titled as “Math in a Minute: R naught and Herd Immunity” published at
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