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CARDS Tx PCR levels and serologic responses in 10 subjects with persistent Mycoplasma pneumoniae infection. A, PCR. B, CARDS Tx IgM. C, IgG titers. Each line represents an individual case. The index case is shown in bold dashed lines. CARDS Tx genome levels graphed at 10−1 genomes represent samples that were below the detectable limits for the assay. CARDS Tx = community-acquired respiratory distress syndrome toxin; OD = optical density; PCR = polymerase chain reaction.
