This is an old strategy. Started at least with delta. The easy response is "what environmental pressures are naive immune systems placing on the virus that make it mutate in a direction that causes the vaccine to lose effectiveness?
Fauci: https://youtu.be/81nsjv7E-OE
This is an old strategy. Started at least with delta. The easy response is "what environmental pressures are naive immune systems placing on the virus that make it mutate in a direction that causes the vaccine to lose effectiveness?
Fauci: https://youtu.be/81nsjv7E-OE