My understanding is that animals such as bats carry many virus. The virus finds itself in another host and then another. It has not mutated but travelled a very complicated route.
Covid19 is 80% related to the SARS.
The virus itself does not change in the transmission. If that were the case it could change on a human to human transmission. If that were to happen it would be impossible to treat or to make a vaccine.
Viruses do not mutate, thank God.
Vaccine, page-4
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