FIG. 7.
Chlamydial rechallenge of untreated and oxytetracycline-treated mice. Mice were challenged with 100 ID50 of MoPn 40 days after clearance of a primary infection. Naive mice were infected intravaginally, and chlamydial shedding in these mice was compared to that of secondarily rechallenged oxytetracycline-treated and untreated animals. Mice (10 per group) were cultured for chlamydiae at different time points after rechallenge, and the numbers of infectious organisms shed from the vaginas of the mice were determined by calculating the numbers of recoverable IFUs. The values are means ± the standard errors of the means.