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Results of serum IgG ELISA for 100 episodes of carriage of M. catarrhalis. The y axis is the percent change in OD between the preacquisition and postclearance samples. The dotted line indicates the cutoff (26.7%) for a significant percent change in serum IgG. The nine open circles indicate the samples with a significant increase in percent change from preacquisition to postclearance, while the solid diamonds indicate the negative samples.
