Calcium Induces Chronic Lung Infections (IMAGE) University of Basel Caption Calcium induces a switch from the acute (green) to the chronic virulence state (red) of the pathogen Pseudomonas aeruginosa. Credit Image: University of Basel, Biozentrum 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.