Abstract
In this study we demonstrated that a hemolytic strain of Listeria monocytogenes, but not a nonhemolytic mutant derived from it, translocated in substantial numbers to the mesenteric lymph nodes, spleen, and liver after intragastric inoculation of mice. Growth at 4 degrees C prior to inoculation did not increase the virulence of the nonhemolytic mutant. These results indicate that hemolytic activity is required for the virulence of L. monocytogenes via the gastrointestinal tract, as has been shown previously for parenteral challenge.
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