Resurgence of yellow fever.
D000328:Adult; D000349:Africa / Q000453:epidemiology; D002648:Child; D006801:Humans; D013020:South America / Q000453:epidemiology; D014765:Viral Vaccines; D015004:Yellow Fever / Q000453:epidemiology* / Q000517:prevention & control; D015005:Yellow fever virus / Q000276:immunology
D014765:Viral Vaccines