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Respiratory syncytial virus (RSV) is the leading cause of lower respiratory tract illnesses in infants worldwide. Both RSV-G and RSV-F glycoproteins play pathogenic roles during infection with RSV. The objective of this study was to compare the effects of anti-RSV-G and anti-RSV-F monoclonal antibodies (mAbs) on airway hyperresponsiveness (AHR) and inflammation after primary or secondary RSV infection in mice. In the primary infection model, mice were infected with RSV at 6 weeks of age. Anti-RSV-G or anti-RSV-F mAbs were administered 24 hours before infection or Day +2 postinfection. In a secondary infection model, mice were infected (primary) with RSV at 1 week (neonate) and reinfected (secondary) 5 weeks later. Anti-RSV-G and anti-RSV-F mAbs were administered 24 hours before the primary infection. Both mAbs had comparable effects in preventing airway responses after primary RSV infection. When given 2 days after infection, anti-RSV-G-treated mice showed significantly decreased AHR and airway inflammation, which persisted in anti-RSV-F-treated mice. In the reinfection model, anti-RSV-G but not anti-RSV-F administered during primary RSV infection in neonates resulted in decreased AHR, eosinophilia, and IL-13 but increased levels of IFN-γ in bronchoalveolar lavage on reinfection. These results support the use of anti-RSV-G in the prevention and treatment of RSV-induced disease.

Effects of Anti-G and Anti-F Antibodies on Airway Function after Respiratory Syncytial Virus Infection