title: Actinomyces hyovaginalis associated with disseminated necrotic lung lesions in slaughter pigs.
abstract: Lungs from 26 slaughter pigs with a diagnosis of pyaemic lung lesions (disseminated necrotic lesions and abscesses), as determined at post-mortem meat inspection, were subjected to a thorough examination, including re-evaluation of gross pathology and histopathological and microbiological examination of samples from multiple lesions. The pulmonary lesions, which appeared identical on gross inspection, could be divided into three histopathological types, namely (1) abscesses, (2) circumscribed (contained) necrotic lesions, and (3) bronchiolar ectasias. Some characteristic relations between bacterial species and histopathological type were demonstrated. Thus, abscesses were dominated by Staphylococcus aureus infections, and circumscribed (contained) necrotic lesions were dominated by infections with an Actinomyces species, identified as Actinomyces hyovaginalis by 16S rRNA gene sequencing. Actinomyces hyovaginalis was demonstrated in 23% of all cases, pointing to this organism as an important agent of disseminated lung lesions of pigs. Furthermore, a characteristic pyogranulomatous reaction with a central area of necrosis was found to be associated with this infection.
authors.affiliation: Department of Veterinary Microbiology, Laboratory of Veterinary Pathology, The Royal Veterinary and Agricultural University, 17 Bülowsvej, DK-1870 Frederiksberg , Denmark.
authors.forename: B
authors.initials: B
authors.lastname: Aalbaek
authors.forename: H
authors.initials: H
authors.lastname: Christensen
authors.forename: M
authors.initials: M
authors.lastname: Bisgaard
authors.forename: C H
authors.initials: CH
authors.lastname: Liljegren
authors.forename: O L
authors.initials: OL
authors.lastname: Nielsen
authors.forename: H E
authors.initials: HE
authors.lastname: Jensen
mesh_terms: D000003:Abattoirs; D000190:Actinomyces / Q000235:genetics / Q000302:isolation & purification* / Q000472:pathogenicity; D000196:Actinomycosis / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D000818:Animals; D015373:Bacterial Typing Techniques / Q000662:veterinary; D001980:Bronchi / Q000473:pathology; D004108:Dilatation, Pathologic / Q000382:microbiology / Q000473:pathology / Q000662:veterinary; D020459:Genes, rRNA; D008169:Lung Abscess / Q000382:microbiology / Q000473:pathology / Q000662:veterinary; D008171:Lung Diseases / Q000382:microbiology / Q000473:pathology / Q000662:veterinary*; D009336:Necrosis; D012329:RNA, Bacterial / Q000032:analysis; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D017422:Sequence Analysis, DNA / Q000662:veterinary; D013552:Swine; D013553:Swine Diseases
chemical_list: D012329:RNA, Bacterial; D012336:RNA, Ribosomal, 16S