[Epidemiological importance of chronic diseases caused by Rickettsia].
D000818:Animals; D004199:Disease Vectors; D006801:Humans; D012283:Rickettsia prowazekii; D014438:Typhus, Epidemic Louse-Borne / Q000453:epidemiology*
Importancia epidemiológica de las recaidas en enfermedades por Rickettsias.