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The Journal of Medical Microbiology, Vol 18, Issue 1 27-37, Copyright © 1984 by Society for General Microbiology

JOURNAL ARTICLE

Factors affecting the lethality of Campylobacter fetus subspecies jejuni in mice

D. E. Stewart-Tull, F. K. Ng and A. C. Wardlaw

Intraperitoneal injection of Campylobacter fetus ss. jejuni into HAM/1CR mice was lethal, but viable counts of bacteria from whole body homogenates, organs and blood indicated that death was not due to sustained bacterial multiplication. Heat-killed organisms (5 X 10(9) cfu) injected into 7-day-old mice caused death within 24 h and this was shown to be due to endotoxin. Both ferric iron and heterologous lipopolysaccharide enhanced virulence; the LD50 was lowered from 1.8 X 10(9) cfu to 2.7 X 10(7) cfu when both were used. Three-day-old or adult animals survived challenge with Campylobacter fetus without clinical symptoms when challenged orally or by intravenous or intraperitoneal routes.




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