When and if a major disaster comes our way we could all be homeless.

Survivors weakened by limited food, water, stress, lousy nutrition, poor sanitation and possibly crowded together will be ripe for far more than just H1N1 infection. Homeless people, even in these relatively normal times, are better than 30 times as likely to get pneumococcal pneumonia as the normal well housed and well fed population.

http://scienceblogs.com/mikethemadbiologist/2009/10/homelessness_and_streptococcus.php

Consider getting immunized for S. pneumoniae