[Some basic concepts in the study of natural foci of infection and parasitic diseases].
D000818:Animals; D004197:Disease Reservoirs; D004199:Disease Vectors; D004463:Ecology; D006801:Humans; D010272:Parasitic Diseases / Q000453:epidemiology* / Q000635:transmission
Nekotorye osnovnye poniatiia ucheniia o prirodnoĭ ochagovosti infektsionnykh i parazitarnykh bolezneĭ