Streptococcus Bacteria (1 of 2) (IMAGE) University of Bristol Caption Streptococcus bacteria (small purple spheres) attacking human cells (nucleus in dark red). Credit T. Buckeridge Usage Restrictions Only to be used once in connection with this story and not to be archived for future use. 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.