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¹ Howard Hughes Medical Institute and ² Department of Molecular and Microbiology, Tufts University School of Medicine, Boston, MA 02111
³ Nuffield Department of Clinical Laboratory Sciences, Oxford University, Oxford OX3 9DU, England, UK

CORRESPONDENCE Ralph R. Isberg: ralph.isberg{at}tufts.edu

Dissemination of Yersinia pseudotuberculosis within mice after oral inoculation was analyzed. Y. pseudotuberculosis translocated to organs such as the liver and spleen shortly after oral inoculation, but was quickly cleared. In contrast, a second temporally distinct bacterial translocation event resulted in successful hepatosplenic replication of the bacteria. Replicating pools of bacteria could be established in these organs in mouse mutants that lacked Peyer's patches. These animals frequently had sterile mesenteric lymph nodes, a finding consistent with translocation taking place independently of regional lymph node colonization. In further contradiction to accepted models for dissemination of enteropathogens, clonal analysis revealed that bacteria causing disease in the spleen and liver of C57BL/6J mice were derived from populations located outside the intestinal lymph nodes. Replication of bacteria in the intestine before translocation appeared critical for dissemination, as transient selective suppression by streptomycin of bacterial growth in the intestine delayed dissemination of Y. pseudotuberculosis. These results collectively indicate that hepatosplenic colonization appears intimately connected with the ability of Y. pseudotuberculosis to successfully establish replication in the intestinal lumen and does not result from ordered spread leading from the intestine to regional lymph nodes before dissemination.

P.D. Barnes's present address is Division of Allergy and Infectious Diseases, University of Washington, Seattle, WA 98195.

P.D. Barnes, M.A. Bergman, and R.R. Isberg contributed equally to this work.

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