Epidemiologic studies of Leptospira grippotyphosa and Leptospira hardjo infections in Iowa cattle.
D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000453:epidemiology*; D007484:Iowa; D007919:Leptospira / Q000302:isolation & purification; D007922:Leptospirosis / Q000453:epidemiology / Q000662:veterinary*