title: Mesenteric lymph node granulomatous lesions in naturally infected wild boar (Sus scrofa) in Portugal--Histological, immunohistochemical and molecular aspects.
abstract: Several studies have demonstrated that wildlife reservoirs of mycobacteria are responsible for the maintenance and spreading of the infection to livestock and wildlife counterparts. Recent data report the role of wild boar (Sus scrofa) as a reservoir for Mycobacterium bovis. This study was conducted to evaluate the chronic inflammatory response in the mesenteric lymph nodes (MLN) of wild boar with granulomatous lymphadenitis (n=30). Morphological parameters of the lesions were recorded. The expression of CD3 and CD79α molecules was evaluated by immunohistochemistry. Molecular genotyping and culture to identify mycobacteria were performed. The lesions consisted mainly of stage III and stage IV granulomas. CD3 and CD79α positive cells were observed in 15 (50%) and in 11 (36.6%) MLN, respectively. In these lesions, higher percentages of T lymphocytes were found and a limited number of animals exhibited a tendency for an increased percentage of B lymphocytes. Our results suggest that there are similar percentages and distribution patterns of CD3 and CD79α in the lesions, regardless of the presence of Mycobacterium avium subsp. paratuberculosis (Map), M. bovis or Map-M. bovis co-infection, and confirm that wild boar is both susceptible and could be an important Map and M. bovis wild reservoir in the study area.
authors.affiliation: CECAV, Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal; Escola Superior Agrária, Instituto Politécnico de Castelo Branco, Castelo Branco, Portugal. Electronic address: acmatos@ipcb.pt.
authors.forename: A C
authors.initials: AC
authors.lastname: Matos
authors.affiliation: Departamento de Ciências Veterinárias, Universidade de Trás-os-Montes e Alto Douro, UTAD, Quinta de Prados, 5000-801 Vila Real, Portugal.
authors.forename: S
authors.initials: S
authors.lastname: Andrade
authors.affiliation: Escola Superior Agrária, Instituto Politécnico de Castelo Branco, Castelo Branco, Portugal.
authors.forename: L
authors.initials: L
authors.lastname: Figueira
authors.affiliation: Departamento de Genética e Biotecnologia, Centro de Genómica e Biotecnologia, Instituto de Biotecnologia e Bioengenharia, Universidade de Trás-os-Montes e Alto Douro, Portugal.
authors.forename: M
authors.initials: M
authors.lastname: Matos
authors.affiliation: CECAV, Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal; Departamento de Ciências Veterinárias, Universidade de Trás-os-Montes e Alto Douro, UTAD, Quinta de Prados, 5000-801 Vila Real, Portugal.
authors.forename: M A
authors.initials: MA
authors.lastname: Pires
authors.affiliation: CECAV, Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal; Departamento de Ciências Veterinárias, Universidade de Trás-os-Montes e Alto Douro, UTAD, Quinta de Prados, 5000-801 Vila Real, Portugal.
authors.forename: A C
authors.initials: AC
authors.lastname: Coelho
authors.affiliation: CECAV, Centro de Ciência Animal e Veterinária, Universidade de Trás-os-Montes e Alto Douro, Quinta de Prados, 5000-801 Vila Real, Portugal; Departamento de Ciências Veterinárias, Universidade de Trás-os-Montes e Alto Douro, UTAD, Quinta de Prados, 5000-801 Vila Real, Portugal.
authors.forename: M L
authors.initials: ML
authors.lastname: Pinto
mesh_terms: D000818:Animals; D000835:Animals, Wild / Q000382:microbiology; D001402:B-Lymphocytes; D004197:Disease Reservoirs / Q000382:microbiology / Q000662:veterinary*; D006099:Granuloma / Q000382:microbiology / Q000662:veterinary*; D008198:Lymph Nodes / Q000382:microbiology / Q000473:pathology*; D018655:Lymphocyte Count / Q000662:veterinary; D016927:Mycobacterium avium subsp. paratuberculosis; D009163:Mycobacterium bovis; D010283:Paratuberculosis / Q000382:microbiology / Q000473:pathology; D011174:Portugal; D034421:Sus scrofa / Q000382:microbiology*; D013552:Swine; D013553:Swine Diseases / Q000382:microbiology* / Q000473:pathology; D013601:T-Lymphocytes; D014376:Tuberculosis / Q000382:microbiology / Q000662:veterinary
keywords: Immunohistochemistry; Mesenteric lymph nodes; Mycobacteriosis; Sus scrofa; Wild boar