title: Induction of mycoplasmal pneumonia in experimentally infected pigs by means of different inoculation routes.
abstract: The purpose of this study was to assess the effect of three different inoculation routes into mycoplasmal pneumonia (MP) in pigs challenged with Mycoplasma hyopneumoniae (M. hyopneumoniae). Thirty six-week-old M. hyopneumoniae seronegative piglets were randomly assigned to four groups: three challenged groups with experimentally inoculated pigs by either the endotracheal (ET; n = 8), intranasal (IN; n = 8) or aerosol (AE; n = 8) routes and one uninfected group (Control; n = 6). Blood samples were collected 1 day before challenge and at necropsy, 28 days post-inoculation (dpi), to assess seroconversion. Laryngeal swabs were collected at -1, 7, 14, 21 and 28 dpi in order to evaluate colonization. At necropsy, lung lesions were scored and lung tissue was collected for histopathological studies and M. hyopneumoniae DNA detection. Broncho-alveolar lavage fluid (BALF) was also obtained to detect M. hyopneumoniae DNA, specific IgA antibodies and cytokines. MP was observed in all inoculated groups, but the ET group displayed a significantly higher number of animals affected by MP as well as a higher mean lung lesion score. These results were paralleled with an earlier seroconversion and upper respiratory tract colonization of M. hyopneumoniae. Additionally, in the ET group, higher levels of pro-inflammatory cytokines and specific IgA antibodies in BALF were found. Under the conditions of the present study, MP was reproduced by the three evaluated inoculation routes. Obtained results suggest that the ET route is the most effective in order to induce MP in pigs experimentally challenged with M. hyopneumoniae.
authors.affiliation: IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain.|Boehringer Ingelheim España S.A, Carrer Prat de la Riba, 50, 08174, Sant Cugat del Vallès, Spain.
authors.forename: Beatriz
authors.initials: B
authors.lastname: Garcia-Morante
authors.affiliation: UAB, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain.|Departament de Sanitat i Anatomia Animals, Facultat de Veterinària, UAB, 08193, Bellaterra, Spain.
authors.forename: Joaquim
authors.initials: J
authors.lastname: Segalés
authors.affiliation: IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain.
authors.forename: Sergio
authors.initials: S
authors.lastname: López-Soria
authors.affiliation: IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain.
authors.forename: Ana Pérez
authors.initials: AP
authors.lastname: de Rozas
authors.affiliation: Boehringer Ingelheim Veterinary Research Center GmbH & Co, BemeroderStraße 31, 30559, Hannover, Germany.
authors.forename: Henrike
authors.initials: H
authors.lastname: Maiti
authors.affiliation: Boehringer Ingelheim Veterinary Research Center GmbH & Co, BemeroderStraße 31, 30559, Hannover, Germany.
authors.forename: Teresa
authors.initials: T
authors.lastname: Coll
authors.affiliation: IRTA, Centre de Recerca en Sanitat Animal (CReSA, IRTA-UAB), Campus de la Universitat Autònoma de Barcelona, 08193, Bellaterra, Spain. marina.sibila@irta.cat.
authors.forename: Marina
authors.initials: M
authors.lastname: Sibila
mesh_terms: D000280:Administration, Inhalation; D000281:Administration, Intranasal; D000284:Administration, Oral; D000818:Animals; D001992:Bronchoalveolar Lavage Fluid / Q000382:microbiology; D008168:Lung / Q000382:microbiology / Q000473:pathology; D045705:Mycoplasma hyopneumoniae; D045729:Pneumonia of Swine, Mycoplasmal / Q000382:microbiology* / Q000473:pathology; D013552:Swine