H1N1 (IMAGE) Marine Biological Laboratory Caption This colorized negative stained transmission electron micrograph (TEM) depicts some of the ultrastructural morphology of the A/CA/4/09 swine flu virus. Credit CDC/C. S. Goldsmith and A. Balish Usage Restrictions Use with appropriate credit. 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.