Abstract
We examined 55 Enterobacter cloacae isolates from clinical specimens for the production of cytotonic and cytotoxic toxins and the presence of the type III secretion system (TTSS). Twelve isolates (22%) revealed cytotoxic activity that caused destruction of Vero cells, whereas 28 (51%) strains induced lysis of the murine macrophage J774 cell line. TTSS genes were present in 27% of the isolates. The results indicated that these bacteria may destroy phagocytes and epithelial cells, which may lead to spread within the host.
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