Abstract
Whole-cell and outer membrane preparations of Campylobacter mucosalis, C. hyointestinalis, C. jejuni, and C. coli isolated from porcine intestines were compared with preparations of intracellular Campylobacter-like organisms extracted directly from the lesions of pigs with proliferative enteropathy. By gradient polyacrylamide gel electrophoresis, outer membrane and total protein profiles of C. mucosalis, C. hyointestinalis, C. jejuni, and C. coli were significantly different from each other and from those of the Campylobacter-like organisms. Immunoblotting of these preparations with rabbit antisera or monoclonal antibodies prepared against the intracellular Campylobacter-like organisms showed strong reactions only with a 25,000- to 27,000-molecular-weight component of preparations of the intracellular organisms. Antisera to cultivable Campylobacter species isolates did not react with preparations of intracellular organisms. Isoelectric focusing of sonicated preparations showed protein profile differences and an immune-reactive component in the intracellular organisms with a pI of 4.5. This study suggests that the intracellular Campylobacter-like organism associated with proliferative enteropathy may be a novel bacterium with significant antigenic differences from the Campylobacter species previously associated with the disease.
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