3.5 Temporal changes of RT-PCR and chest CT
For treatment responds, a follow-up review of the treatment responds of
RT-PCR for children indicated that (Figure 2), there were no truly
negative RT-PCR results until 7 days after the onset of symptoms. There
were 52 (46%) truly negative RT-PCR results cases on the 14th day, 92
(81%) cases on the 21st day, and 106 (93%) cases on the 28th day, and
the latest time for RT-PCR to turn negative was 37 days after the onset
of symptoms.
A total of 215 chest CTs were obtained from 114 children with COVID-19.
In Figure 3, the CT scores on lung involvement were plotted in function
of time. CT score reached 14 in 1 case during the 0-5 days from the
onset of symptoms, but the median values of CT scores were low before
the 11th day from the onset of symptoms, with the median value of 1. The
median value of CT score on lung involvement reached a peak at 12-17
days, with the median value of 2. After the 24th day from onset of
symptoms, the median value of CT score fell back to 1.