Addition of BcfA to aPV increases IL-17 and decreases IL-5 production from immune spleen cells. Spleens from aPV- and aPV/BcfA-immunized mice were dissociated and stimulated in vitro for 7 days with FHA, Prn, or PT. Supernatant was tested by ELISA for IFN-γ (A), IL-17 (B), and IL-5 (C). **, P < 0.01; ***, P < 0.005.