title: Letter: Delayed attacks of malaria in visitors to the tropics.
mesh_terms: D002738:Chloroquine / Q000627:therapeutic use; D006801:Humans; D008288:Malaria / Q000517:prevention & control*; D011739:Pyrimethamine / Q000627:therapeutic use; D013997:Time Factors; D014195:Travel; D014329:Tropical Climate
chemical_list: D002738:Chloroquine; D011739:Pyrimethamine