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Identification of a novel antigen from Corynebacterium pseudotuberculosis that protects sheep against caseous lymphadenitis

, : Identification of a novel antigen from Corynebacterium pseudotuberculosis that protects sheep against caseous lymphadenitis. Infection and Immunity 62(6): 2562-2567

A 40-kDa protein antigen from Corynebacterium pseudotuberculosis has been identified by application of a strategy that employs locally derived antibody-secreting cells (ASC). ASC probes generated by culture of ASC obtained from the lymph node draining the site of infection showed a specificity restricted to a 40-kDa antigen. Analysis of immunoblots with sequential serum samples taken from sheep during the course of experimental primary infection with C. pseudotuberculosis also revealed the 40-kDa antigen as an early immunodominant antigen. Sheep vaccinated with two 100-microgram doses of a 40-kDa antiagen preparation in aluminium hydroxide adjuvant were protected against infection with C. pseudotuberculosis, with an 82% reduction in the proportion of infected sheep and a 98% reduction in lung lesions. Sera from vaccinated sheep exhibited a strong response only to the 40-kDa antigen on immunoblots. These results strongly suggest that the 40-kDa antigen plays a major role in immunity to caseous lymphadenitis.

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Accession: 002863208

PMID: 8188379

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