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The proportion of nasal-oropharyngeal (OP) and oral fluid matched specimens that were positive in participants who are 1–5 days, 6–10, and more than 11 days after symptom onset in samples from participants where the date of symptom onset could be determined. Eight participants without a date of symptom onset (19 specimen pairs) are not included in this figure. RT-PCR, reverse-transcription polymerase chain reaction.
