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Proportions of first (A) or second (confirmation) (B) positive sample in the infection group compared to the single positive sample in the no infection group. The colored areas represent the 95% confidence intervals. Median time to positivity was 5 days (95% CI, 4 to 5 days) for the first sample, 6 days (95% CI, 5 to 7 days) for the second positive sample in the infection group to confirm infection, and 9 days (95% CI, 7 to 10 days) in the no infection group.
