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The Journal of Medical Microbiology, Vol 48, Issue 9 801-810, Copyright © 1999 by Society for General Microbiology

JOURNAL ARTICLE

Invasiveness of Salmonella serotypes Typhimurium, Choleraesuis and Dublin for rabbit terminal ileum in vitro

A. J. Bolton, G. D. Martin, M. P. Osborne, T. S. Wallis and J. Stephen
Microbial Molecular Genetics and Cell Biology Group, School of Biological Sciences, University of Birmingham, Edgbaston.

Ten recent clinical isolates of Salmonella serotype Typhimurium from man that were tested for their invasiveness in rabbit ileal explants in vitro, were compared with Typhimurium strain TML, a well-characterised invasive strain isolated from a case of human gastro-enteritis. Nine of the 10 strains showed invasiveness that was comparable to that of strain TML. One isolate (GM3) was apparently substantially less invasive; electron microscopy showed this strain to be histotoxic - the probable reason for its reduced recovery from ileal mucosa and thus apparent 'low' invasiveness. Salmonella serotype Choleraesuis strain A50, isolated from a case of systemic salmonellosis in pigs, and serotype Dublin strain 3246, isolated from a case of systemic salmonellosis in calves, were also examined. Dublin strain 3246, when grown at 37 degrees C and used immediately in the invasion assay, damaged the mucosa in a manner similar to that of Typhimurium strain GM3, whereas Dublin strain 3246 grown at 37 degrees C and stored overnight at 4 degrees C did not. This was reflected in an apparently lower invasiveness of freshly grown organisms compared with that of organisms stored at 4 degrees C. In contrast, the histotoxicity of Typhimurium strain GM3 was not affected by storage at 4 degrees C. When stored at 4 degrees C, the levels of invasiveness of Choleraesuis strain A50 and Dublin strain 3246 were not significantly different from each other or from Typhimurium strain TML.


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