Infection with the respiratory syncytial virus, an RNA virus of the genus Pneumovirus, in the family Paramyxoviridae, which is characterized by the formation of syncytia in tissue culture. It causes minor respiratory infection with rhinitis and cough in adults, but is capable of causing severe bronchitis and bronchopneumonia in young children. The disease is Monarch Disease Ontology id MONDO_0001577 (respiratory syncytial virus infectious disease). Also known as: Human respiratory syncytial virus infection, respiratory syncytial virus infection.