The tremendous recovery in the stock exchanges after falling 36% between February and March 23, 2020, surprised many as it coincided with the spread of the coronavirus, and recently with the appearance of a more powerful mutant form of the virus in…
read moreWhen the majority of the population is immunized against an infectious disease, Herd immunity provides indirect protection, or collective immunity, to those who are not immunized against the disease. For example, if 80% of a population is immune to a virus, four…
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