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The ability of recombinant vaccinia viruses that separately encoded 9 of the 10 known respiratory syncytial virus (RSV) proteins to induce resistance to RSV challenge was studied in BALB/c mice. Resistance was examined at two intervals following vaccination to examine early (day 9) as well as late (day 28) immunity. BALB/c mice were inoculated simultaneously by the intranasal and intraperitoneal routes with a recombinant vaccinia virus encoding one of the following RSV proteins: F, G, N, P, SH, M, 1B, 1C, or M2 (22K). A parainfluenza virus type 3 HN protein recombinant (Vac-HN) served as a negative control. One half of the mice were challenged with RSV intranasally on day 9, and the remaining animals were challenged on day 28 postvaccination. Mice previously immunized by infection with RSV, Vac-F, or Vac-G were completely or almost completely resistant to RSV challenge on both days. In contrast, immunization with Vac-HN, -P, -SH, -M, -1B, or -1C did not induce detectable resistance to RSV challenge. Mice previously infected with Vac-M2 or Vac-N exhibited significant but not complete resistance on day 9. However, in both cases resistance had largely waned by day 28 and was detectable only in mice immunized with Vac-M2. These results demonstrate that F and G proteins expressed by recombinant vaccinia viruses are the most effective RSV protective antigens. This study also suggests that RSV vaccines need only contain the F and G glycoproteins, because the immunity conferred by the other proteins is less effective and appears to wane rapidly with time.

journal of virology

Respiratory syncytial virus (RSV) F, G, M2 (22K), and N proteins each induce resistance to RSV challenge, but resistance induced by M2 and N proteins is relatively short-lived