Two cases of novel coronavirus infection (COVID-19) with transient viral elevation using semi-quantitative real-time reverse transcription PCR and symptom relapse after completion of 10 days of favipiravir treatment.

The viral load obtained by real-time RT-PCR examination showed a decreasing trend during favipiravir treatment, but a transient fever, malaise, dyspnea, and tachypnea on exertion were observed on day 11, the day after the end of treatment, and a transient rise in viral load was observed at the same time ( Fig. 2 ).

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