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Protection against MoPn infection. BALB/c mice were immunized as described in the legend to Fig. 1. The mice were challenged with 1,000 IFU of MoPn EBs 14 days after boosting and killed on day 10 postinfection. Chlamydial growth in the lungs was analyzed by quantitative tissue culture. The data are means ± SEM. ∗∗, P < 0.001 compared with N and P < 0.01 compared with IS and pc/IS; ∗, P < 0.01 compared with N; P < 0.01 when pM/IS is compared with IS or pc/IS.
