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Proportions of dengue virus (DENV) transcription-mediated amplification (TMA) repeat-reactive donations during the study period (solid bars; left Y axis) and of DENV immunoglobulin (Ig) M–positive/IgG-positive donations at the beginning and end of the study period (hatched bars; right Y axis). All TMA repeat-reactive donations were confirmed as RNA positive by polymerase chain reaction testing and typed as DENV-4. Abbreviation: CI, confidence interval.
