As a note, please do not try this at home. There would be a large amount of selective pressure for the virus to change the genetic sequence it recognizes / is i

As a note, please do not try this at home. There would be a large amount of selective pressure for the virus to change the genetic sequence it recognizes / is inhibited by, and suddenly you've got a virus that can infect the "wrong" people. Likewise a vaccine puts significant selective pressure towards immune escape.