Severe RSV disease is primarily a disease of young infants and children. According to Chatterjee and colleagues, RSV infects "almost every child" before the age of 2 years. Moreover, those younger than 1 year have had RSV twice.
Although boys and girls are equally affected by milder RSV disease, boys are approximately twice as likely to be hospitalized for RSV disease.
RSV infection is primarily seen in the winter months throughout United States except in the state of Florida, where the window of infection extends throughout much of the year. Nationally, the onset of RSV season ranges from mid-September to mid-November, peaks from mid-December to mid-February, and the off-season occurs mid-April to mid-May. In tropical climates, peak RSV activity correlates with the rainy season.
Reinfection with RSV occurs throughout life, with disease becoming increasingly limited to the upper respiratory tract with advancing age.
Learn more about the epidemiology of RSV.
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Cite this: Asif Noor. Fast Five Quiz: Overview of Pediatric Respiratory Syncytial Virus - Medscape - Mar 03, 2022.