Resurgence of wild poliovirus types 1 and 3 in 15 African countries, January 2008-March 2009.
D000351:Africa, Eastern / Q000453:epidemiology; D000353:Africa, Southern / Q000453:epidemiology; D000354:Africa, Western / Q000453:epidemiology; D004196:Disease Outbreaks; D006801:Humans; D011051:Poliomyelitis / Q000453:epidemiology* / Q000517:prevention & control / Q000635:transmission; D017955:Poliovirus