Ghost would definitely be a huge antivax conspiracist.
Beast would do antivax propaganda, so the pandemia gets worse and Krakoa can later sell a miracle remedy.
Apocalypse would be antivax, because for him, anibody who would die without a vaccine deserves to die.
I wonder where Cardiac would stand. He absolutely hates big pharma, and that can sometimes make him irrational. On the other hand, he cares about saving lives and he is s scientist, so he would see the benefit of vaccines.