title: Serological control of SPF and conventional swine herds for Mycoplasma hyopneumoniae infection.
mesh_terms: D000818:Animals; D009175:Mycoplasma Infections / Q000517:prevention & control / Q000662:veterinary*; D013047:Specific Pathogen-Free Organisms; D013552:Swine; D013553:Swine Diseases / Q000517:prevention & control*