Influenza Illustration (IMAGE) University of California - Riverside Caption This image illustrates the beginning stages of an influenza infection and shows what happens after the influenza viruses enter the human body. Credit Centers for Disease Control and Prevention 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.