Studied Nursing at University of South Dakota (Graduated 1996)Dec 6Because in order to mutate, a virus has to be able to infect new hosts and rewrite the DNA inside the host's cells to replicate itself. A virus also can't survive unless it does this.
Enough people have been vaccinated for these diseases that the disease has been eradicated (smallpox) or close to it. There aren't enough people susceptible to these diseases in a community for it to gain a foothold. So even people who, for whatever reason, are still susceptible, they won't know it because they aren't exposed to it. This is how herd immunity works.
Covid still has plenty of susceptible people to infect and in large enough numbers for it to mutate and create variants. This is what viruses do.
The pandemic will continue as long as there are susceptible hosts for COVID to infect. The variants will continue until the number of susceptible hosts drastically decreases.
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