title: Local and systemic immune responses in pigs intramuscularly injected with an inactivated Mycoplasma hyopneumoniae vaccine.
abstract: The immune response induced by intramuscular administration of a commercial inactivated Mycoplasma hyopneumonie whole-cell vaccine (Suvaxyn(®)MH One) was investigated in conventional M. hyopneumoniae-free pigs. The animals were assigned randomly to two groups: non-vaccinated and vaccinated. Pigs in the vaccinated group were injected intramuscularly with the vaccine at 7 days of age, whereas non-vaccinated pigs received physiological saline solution (PBS). Pigs were euthanized and necropsied at 30, 36 and 58 days of age. Blood, bronchoalveolar lavage (BAL) fluid, spleen, lung and bronchial lymph nodes (BLN) were collected. Serum and BAL fluid were tested for the presence of antibodies by ELISA. Monomorphonuclear cells from the peripheral blood and tissues were isolated to quantify the T cell subsets by flow cytometry, and cytokine production by ELIspot and ELISA. Antibodies against M. hyopneumoniae were detected in serum of most vaccinated pigs at 30 days of age. M. hyopneumoniae specific IgG, IgM and IgA were detected in BAL fluid from vaccinated animals, but not from control animals. Significantly higher numbers of IL-12 secreting cells were observed in the lung at day 58 in the vaccinated than in the non-vaccinated group (p<0.05). The number of IL-10 secreting cells from BLN was also higher in the vaccinated group at day 58 (p<0.05). After restimulation in vitro, lymphocytes from BLN and lungs secreted significantly higher levels of IL-12 in the vaccinated group at day 58. These results show that the vaccine induced both systemic and mucosal cellular and humoral immune responses.
authors.affiliation: Department of Pathology, Bacteriology and Avian Diseases, Ghent University, Faculty of Veterinary Medicine, Salisburylaan 133, B-9820 Merelbeke, Belgium. silvana.beutingermarchioro@ugent.be
authors.forename: Silvana Beutinger
authors.initials: SB
authors.lastname: Marchioro
authors.forename: Dominiek
authors.initials: D
authors.lastname: Maes
authors.forename: Bram
authors.initials: B
authors.lastname: Flahou
authors.forename: Frank
authors.initials: F
authors.lastname: Pasmans
authors.forename: Rubén
authors.initials: R
authors.lastname: Del Pozo Sacristán
authors.forename: Katleen
authors.initials: K
authors.lastname: Vranckx
authors.forename: Vesna
authors.initials: V
authors.lastname: Melkebeek
authors.forename: Eric
authors.initials: E
authors.lastname: Cox
authors.forename: Niels
authors.initials: N
authors.lastname: Wuyts
authors.forename: Freddy
authors.initials: F
authors.lastname: Haesebrouck
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000032:analysis / Q000097:blood; D001428:Bacterial Vaccines / Q000008:administration & dosage* / Q000276:immunology*; D001769:Blood / Q000276:immunology; D001992:Bronchoalveolar Lavage Fluid / Q000276:immunology; D016207:Cytokines / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D058501:Enzyme-Linked Immunospot Assay; D005434:Flow Cytometry; D007070:Immunoglobulin A / Q000032:analysis / Q000097:blood; D007074:Immunoglobulin G / Q000032:analysis / Q000097:blood; D007075:Immunoglobulin M / Q000032:analysis / Q000097:blood; D007273:Injections, Intramuscular; D007963:Leukocytes, Mononuclear / Q000276:immunology; D045705:Mycoplasma hyopneumoniae / Q000276:immunology*; D045729:Pneumonia of Swine, Mycoplasmal / Q000276:immunology / Q000517:prevention & control*; D013552:Swine; D015164:Vaccines, Inactivated / Q000008:administration & dosage / Q000276:immunology
chemical_list: D000907:Antibodies, Bacterial; D001428:Bacterial Vaccines; D016207:Cytokines; D007070:Immunoglobulin A; D007074:Immunoglobulin G; D007075:Immunoglobulin M; D015164:Vaccines, Inactivated