The opposite could happen though. "Vaccination" allows for the virus to mutate to a more lethal strain since it does not sterilize the host. See Marek's disea

The opposite could happen though. "Vaccination" allows for the virus to mutate to a more lethal strain since it does not sterilize the host. See Marek's disease: https://en.wikipedia.org/wiki/Marek's_disease https://en.wikipedia.org/wiki/Marek's_disease https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4516275/ https://www.ncbi.nlm.nih.gov/pmc/articles/PMC4516275/