Infections/illnesses. Whooping cough--more common than we think...and measles is still with us.
D002648:Child; D004196:Disease Outbreaks; D006801:Humans; D007196:Indiana / Q000453:epidemiology; D008457:Measles / Q000453:epidemiology* / Q000635:transmission; D014195:Travel; D014917:Whooping Cough / Q000175:diagnosis* / Q000276:immunology