Year 'round RSVI found a couple of links that DO indeed state that RSV, esp. in Florida, are year 'round:
RSV epidemics year 'round
"RSV outbreaks occur each year on a fairly predictable schedule that varies from one region to another. In the United States, the RSV epidemic "season" usually begins in the Fall, and lasts through Spring. However, in some parts of the United States, such as Southern Florida, year-round epidemic levels have been seen."
Respiratory Syncytial Virus No Longer Seasonal
"A new study has documented an ongoing, nonseasonal epidemic of respiratory syncytial virus (RSV) among children in the southeastern US, challenging the general conception of RSV as a seasonal condition that peaks in the winter months.
"Researchers report that of 5000 fresh nasal aspirates or washings collected year-round from pediatric patients in large southern hospitals during the period from May 1993 to December 1996, 28% were positive for the RSV antigen. The report appeared in the May issue of the Southern Medical Journal (1998; 91:433-436).
"The authors label their findings "a persistent epidemic," defining epidemic as 2 consecutive months in each of which at least 10% of specimens were positive and at least 2 positive specimens were detected.
"Health authorities are recommending that clinicians, especially those in the southeastern US, consider RSV year-round in the differential diagnosis of acute respiratory illness in pediatric patients."
Year 'round RSV in equatorial regions
"Unlike influenza, which tends to have severe epidemics every 10 to 15 years with a short peak period, RSV incidence is regular and substantial occurring every year during the winters in both the Northern and Southern Hemispheres and virtually year round in equatorial regions."
Florida Dep't of Health - RSV Surveillance
"Although RSV is present year-round in Florida, peak activity is detected in the winter months. RSV is considered to be widespread when at least 10% of all specimens tested for RSV during a surveillance week are positive. In Florida, the Department of Health’s RSV Surveillance System monitors RSV activity at the state, regional and local levels. RSV surveillance began in October 1999 for the North, Central, Southeast, and Southwest regions of the state and in January 2001 for the Northwest region. The RSV Surveillance System is an essential component to the statewide effort of preventing and controlling RSV year round."
Bureau of Epidemiology, Fla Dep't of Health Data
This page shows a chart of data collected; the Southeast (in bright blue) peaks year around over the 10% guideline that the US Dep't of Health uses to track RSV epidemia. As you can see, it is always well over 10%, yet overall peaks less often than other US regions. This simply means there is a steady epidemia of RSV infections throughout the Southeast states.