<i>Serratia</i> is able to induce autophagy in different epithelial cell lines.

<p>HeLa, MEFs <i>Atg5</i>^+/+, MEF <i>Atg5</i>^−/− and T24 cells were transiently transfected with pRFP-LC3 (left panels, red fluorescence) and invaded with wild-type <i>S. marcescens</i> transformed with pGFP (right panels, green fluorescence). Cells were fixed at 180 min p.i. and visualized by confocal laser microscopy. Images are representative of at least 300 infected cells monitored in two independent assays. Bars: 10 µm.