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viruses that can be divided into four genera, namely, alpha, beta, gamma and delta. of these, alpha and beta are known to infect humans. until the turn of the century, only four human covs ( e, nl , oc and hku ) were known, and these are globally endemic (continuously circulating), accounting for nearly
regional in the case of mers—with a large number of cases and deaths. and now there is the -ncov, which, too, is a highly pathogenic variety of human cov. coronaviruses infect a large number of animals and humans. they are zoonotic in origin; that is, they are the result of a "spillover" from animal...
https://frontline.thehindu.com/the-nation/public-health/article30800997.ece