MRSA Genome Predicts Toxicity (image) Cold Spring Harbor Laboratory Caption This is a highly toxic MRSA strain (top) and less toxic strain (bottom) cultured on a blood agar plate. Credit Image courtesy of Ruth Massey Usage Restrictions Image may be used with appropriate credit to the source. 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.