Optimal Cutoff Titers for Indirect Immunofluorescence Assay for Diagnosis of Scrub Typhus.
Cherry LimStuart D BlacksellAchara LaongnualpanichPacharee KantipongNicholas P J DayDaniel Henry ParisDirek LimmathurotsakulPublished in: Journal of clinical microbiology (2015)
We determined the optimal cutoff titers in admission and convalescent-phase samples for scrub typhus indirect immunofluorescence assay using Bayesian latent class models. Cutoff titers of ≥1:3,200 in an admission sample or of a ≥4-fold rise to ≥1:3,200 in a convalescent-phase sample provided the highest accuracy (sensitivity, 81.6%; specificity, 100%).