Abstract
Enzootic pneumonia (EP) in pigs caused by Mycoplasma hyopneumoniae is a highly prevalent, chronic respiratory disease, which causes considerable economic losses in the swine industry. Most herds are vaccinated, but classical bacterin vaccines do not prevent colonization and it is not possible to detect flourishing M. hyopneumoniae infections in vaccinated herds since commonly used commercial ELISAs cannot differentiate infected from vaccinated animals. To solve this problem, new immunogenic proteins, up-regulated or solely expressed during infection, need to be identified. For this purpose a peptide-spot array was constructed which presents 105 potential linear B-cell epitopes identified by in silico analysis in 35 putative lipoproteins encoded on the genome of M. hyopneumoniae type strain 232. Subjecting this array to immunoblotting using porcine convalescent serum revealed a single strongly immunoreactive epitope on the Mhp366 protein which did not react with serum from bacterin-immunized pigs. In addition, it was not possible to detect Mhp366 in total cell lysates of in vitro grown M. hyopneumoniae strains, using a polyclonal rabbit serum raised against a recombinant GST-Mhp366 fusion protein. To investigate the possibility ...Continue Reading
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