Evaluation of immunogenicity and protective efficacy of Actinobacillus pleuropneumoniae HB04C(-) mutant lacking a drug resistance marker in the pigs |
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Authors: | Bei Weicheng He Qigai Zhou Rui Yan Lin Huang Hongliang Chen Huanchun |
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Institution: | Division of Animal Pathogens, State Key Laboratory of Agricultural Microbiology, Huazhong Agricultural University, Wuhan, PR China. |
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Abstract: | Previously, we reported the construction and characterization of a genetically defined Actinobacillus pleuropneumoniae (A. pleuropneumoniae) apxIIC gene mutant, HB04C(-), which conferred protection to mice against infection with A. pleuropneumoniae. In this study, we further evaluated HB04C(-) for safety and its ability to elicit protective immunity in pigs. It was demonstrated that a dose of 2 x 10(8) CFU HB04C(-) was safe to the pigs via intranasal or intramuscular injection. Immunization with a dose of 2 x 10(8) HB04C(-) by both intranasal and intramuscular routine could yield equal protective efficacy and elicited significant protection against experiment challenge with homologous or heterologous serotypes of a virulent A. pleuropneumonia. Taken together, HB04C(-) might serve as a promising vaccine candidate against infection with A. pleuropneumoniae. |
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