3.3 RT-PCR characteristics
Detailed information of RT-PCR was displayed in Table 3. All the cases have 3 to 12 times RT-PCR during their hospital stay, and 89 (77%) cases have 5 or less RT-PCR assays. The duration from first positive result to final negative result was within 21 days in 105 (92%) cases. The most common temporal tendency pattern of RT-PCR was positive to negative (91, 80%).