Macrophage with Bacteria (image) Helmholtz Centre for Infection Research Caption A scavenger cell of the immune system ingests bacteria (shown in green). During an influenza infection, the macrophages' appetite is curbed. Credit Manfred Rohde/HZI Usage Restrictions The image may only be used with appropriate credit. 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.