<em>E. coli</em> (IMAGE) Penn State Caption E. coli bacteria sticking to human cell lines seen by an electron microscope. Credit Edward Dudley, Penn State Usage Restrictions Non commercial use only License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.