Oral inoculation of A/J mice for detection of invasiveness differences between Listeria monocytogenes epidemic and environmental strains.

Abstract excerpt

Four-week-old Harlan A/J mice were orally infected with six epidemic and six environmental strains of Listeria monocytogenes. Epidemic strains were significantly more invasive as a group than were environmental strains (P < 0.05), and the intestines of some mice infected with epidemic strains had extensive hemorrhage. Mice inoculated with epidemic strains were significantly more likely to become systemically...

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