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A total of 81 avirulent Tn10 insertion mutants of Salmonella typhimurium have previously been described. These mutants were selected for the inability to survive in murine macrophages. We have characterized the abilities of the most avirulent of these mutants to adhere to, invade, and replicate in both macrophages and nonphagocytic epithelial cells. The results suggest that most mutants contain a defect that is specific to survival within professional phagocytes. These mutants invaded and replicated normally within nonphagocytic human colon adenocarcinoma cells (Caco-2) but did not survive in the macrophage cell line J774. One mutant invaded both macrophages and epithelial cells much less efficiently than the parental strain. The defect associated with this mutant appears to be a result of decreased adherence to animal cells.

Invasion and replication of Salmonella typhimurium in animal cells