GA (IMAGE) University of Utah Caption In the early stages of infection (left) bacteria employ virulence toxins to enter cells. By the time the infection is established, (right) enough of the quorum signaling molecule OHHL has been released by bacteria to communicate that a sufficient number of bacteria are present. The signal shuts down production of toxins. Credit Courtesy Colin Dale/<i>Cell Host & Microbe</i> Usage Restrictions Credit Colin Dale/ Cell Host & Microbe 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.