Epizootiologic and immunologic studies of epizootic bovine abortion.
D000034:Abortion, Veterinary / Q000276:immunology* / Q000517:prevention & control*; D000818:Animals; D002417:Cattle; D002418:Cattle Diseases / Q000517:prevention & control*; D002689:Chlamydia; D005260:Female; D007109:Immunity; D011247:Pregnancy; D011270:Pregnancy, Animal; D014611:Vaccination / Q000662:veterinary