FIG. 4.

Immune responses to S. gordonii DTA₂ in BALB/c mice. (A) Anti-DT and anti-CTB antibodies elicited by intranasal immunization with live S. gordonii DTA₂ in the presence of CTB or with CTB alone. (B) Anti-DT antibodies induced by oral colonization with S. gordonii DTA₂. The values shown are mean titers ± standard error for individual animal samples. In the CTB-alone and SL3 groups, the absence of a bar indicates that an immune response was not detected. VW, vaginal wash.