SUMMARY. Intraperitoneal injection of ss. 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 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 cfu to 2.7 x10 cfu when both were used. Three-day-old or adult animals survived challenge with without clinical symptoms when challenged orally or by intravenous or intraperitoneal routes.


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