title: Immunity to Escherichia coli in pigs: efficacy of a live formalized vaccine under field conditions.
mesh_terms: D000818:Animals; D004927:Escherichia coli Infections / Q000276:immunology / Q000662:veterinary*; D005260:Female; D007273:Injections, Intramuscular; D008321:Mammary Glands, Animal; D011247:Pregnancy; D013552:Swine; D013553:Swine Diseases / Q000276:immunology*; D014613:Vaccines, Attenuated / Q000008:administration & dosage / Q000592:standards*
chemical_list: D014613:Vaccines, Attenuated