Concerns about Leptospira vaccine efficacy study.
D000818:Animals; D001428:Bacterial Vaccines / Q000276:immunology*; D002418:Cattle Diseases / Q000276:immunology*; D007919:Leptospira / Q000276:immunology*; D007922:Leptospirosis / Q000662:veterinary*
D001428:Bacterial Vaccines