title: Virological study of two commerical pig herds with respiratory disease.
mesh_terms: D000256:Adenoviridae / Q000276:immunology / Q000302:isolation & purification; D000818:Animals; D003332:Coronaviridae / Q000276:immunology / Q000302:isolation & purification; D003587:Cytomegalovirus / Q000276:immunology / Q000302:isolation & purification; D004770:Enterovirus / Q000276:immunology / Q000302:isolation & purification; D012141:Respiratory Tract Infections / Q000276:immunology / Q000382:microbiology / Q000662:veterinary*; D013552:Swine; D013553:Swine Diseases / Q000276:immunology / Q000382:microbiology*; D014777:Virus Diseases / Q000276:immunology / Q000382:microbiology / Q000662:veterinary*