That doesn't mean that all vaccinations should be compulsory, of course. There are certain diseases that can only be transmitted by behavior, like HPV. There are others that are too varied for effective herd vaccination, like the flu shot. But when it comes to measles and mumps and rubella and polio, your right to be free of vaccination -- and your right to be a dope with the health of your child because you believe Jenny McCarthy's idiocy -- ends where my child's right to live begins.
The Polio vaccine (live) can give polio to someone whom is immune compromised or hasn’t had the vaccine for some reason. A baby’s POOP can infect someone for up to six weeks IIRC when reading the pamphlet given with my kid’s oral polio vacc.