How does a person find out if all their immunizations are up to date.
Like I know that a person will never be protected from the next great unknown plague, but just being immune from the ones that exist now would be good, right?
Especially considering that if there is a large scale emergency refuge centers are likely to be crowded places and ideal for disease transmission, and that sanitation might be less than ideal too.

It would be a shame to survive a disaster and die 3 weeks later of some dumb refugee herd diseases like the flue or typhoid fever...