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Distribution of number of plasma cases (x-axes) over number of DPO (y-axes) in study of Zika diagnosis, Singapore. F1 immunochromatographic assay format tested with validation set in a blinded manner (Tan Tock Seng Hospital plasma); positive plasma (black) and total plasma cases (gray) over dpo are also shown. A, C) Zika patient samples; B, D) Dengue patient samples. dpo, days postonset of symptoms.
