E. coli (image) University of Exeter Share Print E-Mail Caption These are two types of lab E. coli smeared across an agar plate. The green ones are drug resistant and the blue ones are not. Credit The University of Exeter Usage Restrictions This image may only be used in reports of this research paper Share Print E-Mail 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.