Field evaluation of Haemophilus somnus bacterin.
D000818:Animals; D001428:Bacterial Vaccines; D002417:Cattle; D002418:Cattle Diseases / Q000517:prevention & control*; D006190:Haemophilus / Q000276:immunology*; D006192:Haemophilus Infections / Q000517:prevention & control / Q000662:veterinary*
D001428:Bacterial Vaccines