title: [The 60th anniversary of the creation of the theory of the natural foci of diseases].
authors.forename: U S
authors.initials: US
authors.lastname: Balashov
mesh_terms: D000818:Animals; D004197:Disease Reservoirs; D049673:History, 20th Century; D006801:Humans; D010272:Parasitic Diseases / Q000266:history* / Q000635:transmission; D014586:USSR