Do you want a country that prohibits people from leaving when they want? So you can't require it on exit.
And the most basic right of citizenship is the ability to enter the country, so you can't require it on entry either.
All you can do is convince other countries to prohibit entry without vaccination,
I think it was a good idea. Too bad there's no vaccine against bot flies :(
Infants, the very old, and immunocompromised individuals in particular. Given that there's a large population of HIV-infected individuals in the San Francisco Bay Area, that last might be a significant public concern.
I've heard this is common among the anti-vax crowd. Not saying it is what happened in this case, just giving a personal anecdote.
These methods might not work for all universities, but I know they work for some.
The UK regularly seems small-scale measles outbreaks due to the same idiots.
http://www.nhs.uk/Conditions/vaccinations/Pages/measles-outb...
"Can you still get measles after the MMR vaccination?
It’s extremely unlikely, but you need two doses of MMR to be fully protected. The first dose of the MMR jab protects 90% of those who receive it, and the second dose tops this up to 99% protection. Almost all of the children in the Welsh outbreak who caught measles were either completely unvaccinated or only partially vaccinated."
Assuming everyone was vaccinated then:
2000 people exposed, with 99% effectiveness of vaccine, yields about 20 people who will contract measles despite being vaccinated.
Many vaccines build "herd immunity" and will not work as well if people decide to opt out for some frivolous reason.
Also of course some people cannot receive a specific vaccine because they are pregnant or immunocompromised. Others should be vaccinated to prevent spread to those vulnerable populations, not just to protect themselves.
But seriously, children don't usually get vaccinated for measles until they are 1yo.
Because young children can not be vaccinated, so he should stay away from them for a time (don't know how long).
http://www.cdc.gov/ncezid/dgmq/feature-stories/welcoming-new...
That said, American border guards have been known to turn back drunks coming in from Tijuana, but mostly as a favor to them (since they'd need to be arrested upon reentry due to public drunkenness). If you were in such a situation and insisted upon your admittance, however, I believe you would be let in.