Travel and disease.
D003140:Communicable Disease Control; D004352:Drug Resistance, Microbial; D004641:Emigration and Immigration; D006373:Helminthiasis / Q000453:epidemiology*; D006801:Humans; D007239:Infections / Q000453:epidemiology*; D011528:Protozoan Infections / Q000453:epidemiology*; D014195:Travel; D014330:Tropical Medicine; D006113:United Kingdom; D014777:Virus Diseases / Q000453:epidemiology*