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Abstract
The attenuated Erysipelothrix rhusiopathiae YS-19 strain was constructed for the purpose of delivering the C-terminal portion of the Mycoplasma hyopneumoniae P97 adhesin to the mucosal surface of the respiratory tract of pigs. In this study, the efficacy of the YS-19 vaccine against mycoplasmal pneumonia of swine was evaluated. Animal experiments revealed that intranasal immunization of pigs with the YS-19 strain significantly reduced the severity of pneumonic lung lesions caused by M. hyopneumoniae infection. In YS-19-immunized pigs, P97-specific serum antibodies were not detected. However, when stimulated with the P97 protein, peripheral blood mononuclear cells from the YS-19-immunized pigs had a significantly higher stimulation index ( P<0.05) than that of cells from control pigs at 7 days post-challenge.
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