Reintroduction of malaria into malaria-free areas.
D002648:Child; D004196:Disease Outbreaks; D006801:Humans; D016780:Malaria, Vivax / Q000453:epidemiology*; D008875:Middle Aged; D012846:Singapore / Q000453:epidemiology; D014195:Travel; D014300:Trinidad and Tobago / Q000453:epidemiology