Cinnamon Oil (IMAGE) Washington State University Caption <i>Cinnamomum cassia</i> oil has been shown to kill certain strains of <em>E. coli</em> bacteria. Credit Robert Hubner, WSU Photo Services Usage Restrictions None 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.