All vaccines have possible side effects. I'd assume, not having researched the issue on this, but from general knowledge, that the possible side effects for a

All vaccines have possible side effects. I'd assume, not having researched the issue on this, but from general knowledge, that the possible side effects for a vaccine that would prevent almost no cases outweigh the possible benefits -- for the majority of people anyway. Obviously as the sibling comments explains there are some people who do need it.