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Respiratory syncytial virus (RSV) group-specific immunoglobulin A (IgA) and IgG enzyme-linked immunosorbent assay antibody and neutralizing antibody responses were determined for nasopharyngeal secretions (NPS) from 27 infants and children (6 to 18 months of age) undergoing primary infection with RSV group A or B strain. IgA and IgG antibody responses against RSV envelope glycoproteins (fusion [F] and large [G] glycoprotein) in NPS were also analyzed. Most subjects examined developed moderate levels of NPS IgA and IgG antibodies and neutralizing antibody activity to both group A and B strains in convalescent phase; however, the levels of antibodies to homologous strains were significantly higher than to the heterologous strains. Patients infected with group A developed antibodies in both F and G glycoproteins of A2 strains (group A). Patients infected with group B developed levels of antibody activity to F glycoprotein of A2 strain similar to those of patients infected with group A. However, these subjects developed little or no antibody response to G glycoprotein of A2 strain. These data suggest that the IgA and IgG antibody responses to G glycoprotein in the respiratory tract are group specific. It is suggested that lack of antibody response to the G glycoprotein of the heterologous group in the respiratory tract may determine the outcome of reinfection with other RSV strains.

Respiratory syncytial virus group-specific antibody response in nasopharyngeal secretions from infants and children after primary infection