Comparison of Antibody Concentrations and Protective Activity of Respiratory Syncytial Virus Immune Globulin and Conventional Immune Globulin

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Abstract
Relative to conventional immune globulins (IG, 13 lots), IGs prepared from donors with high activity by microneutralization assay to respiratory syncytial virus (RSVIG, 8 lots) had significantly higher neutralizing antibodies to 6 RSV strains (mean enrichment, 5.2-fold; range, 2.6- to 10.0-fold). In contrast, IgG antibody concentrations to whole RSV, fusion protein, or glycoproteins of A and B strains were similar in RSVIG and IG. Treatment of cotton rats with RSVIG at 0.5 g/kg 24 h before RSV challenge reduced RSV by 99% in the lungs (P < .001). RSVIG at 5.0 g/kg reduced RSV by 99% in the nose. IG at 5.0 g/kg had efficacysimilar to that of RSVIG at 0.5 g/kg. Serum plaque-reduction neutralization titers of 1/390 resulted in 99% reduction of lung RSV and titers of 1/3500 resulted in 99% reduction in nose RSV. Relative to IG, RSVIG is enriched selectively in RSV neutralizing antibodies and has ∼10 times greater protective activity in cotton rats.

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