BART rider with measles potentially exposed thousands in Bay area (opens in new tab)

The externalities of not getting vaccinated (see: this article) makes a strong case for requiring them or at least making a subset of them required upon exit for reentry (similar to passports) without religious exemptions.

Got an email about this from cal, might been exposed, grr. Why don't people vaccinate.

Not everyone is or can be vaccinated, and not everyone vaccinated has immunity. Depending on the virulity of a particular disease, some might be exposed by secondary transmission (e.g., virus particles shed onto an immune individual transferred to a susceptible one). Remember: one (conscious) method of reducing Native American populations was to distribute smallpox-infected blankets among them.

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 knew a women who felt it was her moral duty to fight vaccinations. She had no issue forging documentation saying her kids had gotten vaccinated when they hadn't.

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.

You can get out of vaccinations in many situations with a) a doctor's express diagnosis that you should not be vaccinated or b) claiming to have a religious reason that prohibits vaccination.

These methods might not work for all universities, but I know they work for some.

I doubt the vaccine is 100% effective.