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Respiratory syncytial virus (RSV) A2-specific immunoglobulin (Ig) G, IgG2a, and IgG1 responses and the ratio of IgG2a to IgG1 in lung extract samples collected at day 4 postchallenge. Serially diluted lung samples were used to determine IgG (A, C), IgG2a, and IgG1 (B, D) responses and the ratio (E) in mice immunized with RSV-F viruslike particles (VLPs) or immunized with RSV-G VLPs.
