Yersinia Pestis Proliferating in the Lower Airways During Pneumonic Plague (image) University of North Carolina Health Care Share Print E-Mail Caption Virulent bacteria (red) quickly establish a permissive environment for the growth of non-virulent microbes (green) that would normally be eliminated by the lung's innate immune mechanisms. Credit Goldman Lab, UNC-Chapel Hill. Usage Restrictions None Share Print E-Mail 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.