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. 1974 May;9(5):851–857. doi: 10.1128/iai.9.5.851-857.1974

Experimental Yersinia enterocolitica infection in mice: Kinetics of growth

Philip B Carter 1, Frank M Collins 1
PMCID: PMC414897  PMID: 4596277

Abstract

Infection of several strains of laboratory mice with a virulent strain of Yersinia enterocolitica was followed by performing viable bacterial counts on homogenates of selected tissues at intervals after intragastric, aerogenic, or intravenous infection. It is observed that CD-1 mice are more susceptible to Y. enterocolitica infection than either the C57B1/6 or B6D2 strains. Development of an enteric infection is dose dependent; less than 5 × 107 organisms by mouth yields sporadic, low levels of systemic infection, with many of the animals showing no apparent infection. Increasing the challenge inoculum by a factor of 10 eliminates the variability among the animals, giving rise to an enteric infection in all of the mice that moves quickly to the mesenteric lymph node. The bacterial population in the lymph node multiplies rapidly, and the infection is disseminated to the spleen, liver, and lungs, ultimately killing most of the animals. Exposure to an aerogenic challenge of less than 1,000 organisms resulted in a fulminating pneumonitis with an invariably fatal outcome. Intravenous challenge with 500 organisms caused a rapidly fatal, systemic infection. The growth of the bacteria in the intravenously infected mouse depends upon the temperature at which the challenge inoculum had been grown in vitro. At temperatures below 26 C, the bacteria are cleared from the blood at a slower rate and are more resistant to intracellular killing, as compared to organisms grown at 37 C. This effect results in the inoculum increasing to greater numbers in the tissues in a shorter period of time.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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