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The cumulative percentage of identified cases by RT-PCR and chest CT. Both curves of RT-PCR and CT increased rapidly after the onset of symptoms (n = 114). By the 7th day after the onset of symptoms, 89 (78%) cases have been confirmed by RT-PCR, compared to 53 (46%) cases by chest CT (P < 0.05). By day 14 after the onset of symptoms, RT-PCR diagnosed 112 (98%) cases, but chest CT was positive in only 76 (67%) cases (P < 0.05). 95% CI, 95% confidence interval.
