FIG. 3.

Neutralizing antibody titers in vaccinated mice. Mice were vaccinated i.p. with vP35, vP40, vP35+vP40, vIL-4, dbl-p, or KOS as described in Materials and Methods. Three weeks after the third immunization, 10 mice from two separate experiments were bled, and neutralizing antibody titers were determined by plaque reduction assay. Mock-vaccinated mice were injected similarly with media collected from mock-infected RS cells. Each bar represents the average neutralizing antibody titer from 10 serum samples (two experiments), and the error bars indicate the SEM.