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Mycoplasma hyopneumoniae, the causative agent of porcine enzootic pneumonia, colonizes the respiratory cilia of affected swine, causing significant economic losses to swine production worldwide. Vaccination is the most cost-effective strategy for the control and prevention of this disease. The goal of this study was to design and evaluate a replication-defective recombinant adenovirus, rAdP97c, expressing the C-terminal portion of P97 adhesin (P97c), an important pathogenesis-associated protein of M. hyopneumoniae, as a new vaccine candidate against M. hyopneumoniae infection. P97c-specific immune responses were evaluated in BALB/c mice following intranasal and intramuscular inoculation with rAdP97c. Mice inoculated by both routes of immunization produced significant levels of specific immunoglobulin G (IgG) antibodies in the serum and in bronchoalveolar lavage fluids (BALs). Animals immunized intranasally also produced a significant level of P97c-specific IgA in BALs. Intramuscular inoculation of rAdP97c induced a systemic and mucosal Th1-type biased response, evidenced by the predominance of IgG2a in the serum and BALs, whereas intranasal inoculation resulted in a mixed Th1/Th2-type response (balanced levels of IgG1 and IgG2a) in both sytemic and mucosal compartments. P97c-specific antibodies were able to inhibit the growth of M. hyopneumoniae cells in vitro. These data suggest that rAdP97c vaccine may represent a new strategy for controlling infection by M. hyopneumoniae.

Immune Responses Induced by Replication-Defective Adenovirus Expressing the C-Terminal Portion of the Mycoplasma hyopneumoniae P97 Adhesin