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Receiver operating characteristic curves for the evaluation of the diagnostic accuracy of the Korea Centers for Disease Control and Prevention (KCDC) indirect immunofluorescence assay (IFA) IgM test, KCDC IFA IgG test, and IFA total immunoglobulin test from company A used in commercial laboratories. Either the isolation of Orientia tsutsugamushi from culture or a positive PCR result was used as the gold standard. *, P < 0.001.
