Macrophages with Salmonella Inside (IMAGE) University of Würzburg Caption This is a fluorescence microscopy showing on the left, a macrophage (nucleus in blue) infected with a non-replicating bacteria in yellow indicated by an arrow and on the right infected with bacteria that has replicated (red). Credit (Picture: Antoine-Emmanuel Saliba) 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.