Many animal models of bacterial diseases are hampered by differences in tissue tropism and the course of pathogenesis. In a recent issue of Cell, by rationally mutating a surface invasion protein (InlA) to have higher binding affinity for its cognate host receptor (E-cadherin), Wollert et al. were able to "murinize"Listeria monocytogenes, creating a strain capable of invading intestinal epithelial cells in mice, mimicking the route of infection in humans.
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