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16 kDa envelope proteins in non-Serpulina hyodysenteriae spirochaetes isolated from pigs
  1. F Thom and
  2. DJ Taylor
  1. Department of Pathology, University of Glasgow Veterinary School, Bearsden.


Spirochaetes isolated from field samples of diarrhoea, 'colitis' and mucoid diarrhoea from pigs were examined by a series of cultural, biochemical and serological tests. In addition sodium dodecyl sulphate polyacrylamide gel electrophoresis was used to determine whether the organisms possessed a 16 kDa protein thought to distinguish Serpulina hyodysenteriae from S innocens. Spirochaetal isolates which differed culturally and biochemically from S hyodysenteriae were found to possess a 16 kDa protein. One of these isolates was examined by electron microscopy and found to have an ultrastructure differing from that of S hyodysenteriae. Antiserum to the 16 kDa antigen of S hyodysenteriae reacted with isolate S80/5, the homologous strain, and with B78, the type species, but not with the 16 kDa antigens of the field isolates considered to be S hyodysenteriae or with the non-S hyodysenteriae spirochaetes. It was concluded that there may be a family of 16 kDa proteins located on the envelope of various spirochaetes responsible for diarrhoea in pigs.

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