Editorial: Yellow fever--a continuing problem.
D000330:Aedes; D004196:Disease Outbreaks / Q000453:epidemiology*; D004197:Disease Reservoirs; D006801:Humans; D007303:Insect Vectors; D009549:Nigeria; D012621:Seasons; D015004:Yellow Fever / Q000453:epidemiology* / Q000382:microbiology; D015005:Yellow fever virus / Q000254:growth & development