Community surveillance for wild poliovirus in Ontario, 1993.
D004196:Disease Outbreaks; D006801:Humans; D009426:Netherlands / Q000453:epidemiology; D009864:Ontario / Q000453:epidemiology; D011051:Poliomyelitis / Q000453:epidemiology* / Q000635:transmission; D017955:Poliovirus / Q000145:classification; D012068:Religion and Medicine; D014195:Travel