On the natural focus of scrub typhus in the south of the Primorie area of the USSR.
D000818:Animals; D005455:Fluorescent Antibody Technique; D007303:Insect Vectors; D051379:Mice; D008925:Mites; D012285:Orientia tsutsugamushi / Q000302:isolation & purification*; D012612:Scrub Typhus / Q000382:microbiology*; D014586:USSR