<i>Streptococcus pneumoniae</i> (IMAGE) University of Pennsylvania School of Medicine Caption This is bacteria (Streptococcus pneumoniae, red) under attack by a neutrophil (blue). Credit Jeffrey Weiser, PhD, University of Pennsylvania School of Medicine 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.