RSV (IMAGE) Louisiana State University Caption This transmission electron micrograph (TEM) depicts the liberated, chain-like, ribonucleic acid (RNA) genome of the respiratory syncytial virus (RSV) pathogen. RSV is a negative-sense, enveloped RNA virus. The virion is variable in shape and size, with a diameter ranging between 120 and 300 nm, and is unstable in the environment surviving only a few hours on environmental surfaces. Credit CDC/ Dr. Erskine Palmer 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.