For one thing, HIV doesn't play by the rules.
I haven't had the flu or a flu shot for almost a decade, but that's a weak argument against vaccination.
It's currently home to the worst measles outbreak in the US this year.
It's hard to say if the tactic will work.
California’s anti-vaxxers will no longer be able send their unvaccinated kids to school, if a bill passed by the State Assembly gets signed into law.