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Serum antichlamydial IgG titers of untreated and oxytetracycline-treated mice. The sera of 10 mice were assayed individually by ELISA for IgG antibodies specific to formalin-killed MoPn EBs. End point titers were calculated as the highest dilution of serum producing an optical density of 0.2 or greater. The results are expressed as the mean antibody titer ± the standard deviation.
