Vaccine Research Shows Vigilance Needed against Evolution of More-Virulent Malaria (image) Penn State Share Print E-Mail Caption The image shows red blood cells, some of which are infected with ring-stage malaria parasites. Parasites invade, replicate and rupture from red blood cells multiple times during an infection. Credit Dr. Mae Melvin/US Centers for Disease Control and Prevention Usage Restrictions The image credit must be published along with the image. 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.