title: Mycoplasma hyorhinis in the etiology of serositis among piglets.
abstract: In a study on the involvement of Mycoplasma hyorhinis in serositis of piglets, 26 routine diagnostic animals, 3-7 weeks old, with distinct serofibrinous lesions in the pericardial, pleural and peritoneal cavities were examined. M. hyorhinis was isolated in 9 cases, non-haemolytic Escherichia coli in another 9 cases and in 4 cases both species were found. Neither of the microorganisms were found in the remaining 4 cases. The presence of M. hyorhinis in the serous cavities in the absence of non-haemolytic E. coli was always accompanied by a diagnosis of other disease conditions, mainly of the respiratory tract. In the cases infected with non-haemolytic E. coli complicating problems were absent. The pathogenicity of M. hyorhinis was further studied by inoculation of 2 young pigs in which the typical serofibrinous lesions of the serous cavities were produced. It therefore appears that M. hyorhinis can be regarded as a cause of polyserositis in piglets; under field conditions, however, the synergistic presence of other debilitating syndromes appears necessary for its haematogenous spread from the respiratory tract to the serous cavities.
authors.affiliation: National Veterinary Laboratory, Copenhagen, Denmark.
authors.forename: N F
authors.initials: NF
authors.lastname: Friis
authors.forename: A A
authors.initials: AA
authors.lastname: Feenstra
mesh_terms: D000818:Animals; D004926:Escherichia coli / Q000302:isolation & purification; D004927:Escherichia coli Infections / Q000662:veterinary; D009174:Mycoplasma / Q000302:isolation & purification; D009175:Mycoplasma Infections / Q000382:microbiology / Q000662:veterinary*; D012700:Serositis / Q000382:microbiology / Q000662:veterinary*; D012704:Serous Membrane / Q000382:microbiology; D013552:Swine; D013553:Swine Diseases / Q000382:microbiology*