Any parasite that kills its host won't be around very long. The worst type of parasites keep their hosts alive so that the parasite can continue to spread it's kind.
Thus EBOLA killed itself when it killed it's host. While SARS CoV-2 keeps the host alive long enough for the virus to spread to 8 other hosts before it's human host dies.
And I've been reading that white tailed deer can get Covid 19 and spread it to humans an other deer.




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