Comparison of live C. trachomatis yields in vaginal swabs between mice with and without adaptive immunity following transcervical inoculation. C57BL/6J mice without (solid bars) or with (open bars) deficiency in adaptive immunity or Rag1 (Rag1−/−) were infected with 5 × 106 IFU of C. trachomatis serovar D organisms via transcervical inoculation and were then monitored for live-organism recovery from the genital tract by taking vaginal swabs on days 1, 3, 5, 7, 10, and 14 and weekly thereafter. The number of live organisms recovered from each swab at each time point was expressed as log10 IFU, and group means and standard deviations are shown. n = 4 for each data point from two independent experiments. P values were >0.05 (Wilcoxon rank sum) between the two groups of mice when IFU from the first 7 days were compared and <0.05 between the two groups when IFU from days 10 to 56 or days 1 to 56 were compared.