Respiratory Syncytial Virus (RSV) is one of the leading causes of severe respiratory infections in children. Fortunately, RSV season can often be anticipated, due to yearly monitoring of RSV outbreaks in the US by the United States National Respiratory and Enteric Virus Surveillance System (NREVSS). While the RSV season may start and end at different times from year to year, this chart from 2010-11 by the Centers for Disease Control and Prevention (CDC) gives a nice overview of the RSV season by region. It’s interesting to note how different regions of the US experience different RSV seasons– for instance, in 2010-11 Florida had the longest, clocking in at 27 weeks.