Respiratory syncytial virus (RSV) belongs to the Pneumovirus genus of the Paramyxovirus virus family. RSV is the leading cause of virus-induced lower respiratory tract disease among infants and children (6,21,26) and is the most common pathogen found in children under 5 years of age admitted to the hospital. Essentially every child develops an RSV infection during the first 2 years of life, and recurrent infections are common (20,24,42,44). RSV is especially serious in premature infants and children with bronchopulmonary dysplasia or congenital heart disease. Additionally, in recent studies, RSV was the most common virus identified in the middle-ear fluid of children suffering from acute otitis media (25,43). RSV infection has also been implicated in the development of childhood asthma and other long-term conditions involving pulmonary dysfunction (54-56).

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