Serum and vaginal Ab responses of mice infected with genital Chlamydia. Groups of naïve or female BALB/c mice challenged with C. muridarum and received 100 μl of control Ab or anti-CCL5 Ab solution every 3 days. Following sacrifice 42 days after challenge, Chlamydia-specific serum and vaginal Ab responses of mice were determined by ELISA that was capable of detecting > 20 pg/ml of IgM, IgG, IgA, and IgG subclass Abs. The data presented are the mean concentration of IgG1, IgG2a, IgG2b, IgG3, IgM, IgG, or IgA ± SEM of three separate experiments. Experiments were repeated 3 times to yield 15 mice per group. Asterisks (*) indicate statistically significant differences (p < 0.01) between untreated and control Ab- or anti-CCL5 Ab-treated mice.