This paper has received some attention among clinicians. The viral load of people infected with SARS-CoV-2 peaks 4 to 5 days after the onset of symptoms, not at the time of onset.

The current recommended treatment period in Japan, which is five days from the day after onset of symptoms, may need to be revised.

https://academic.oup.com/cid/advance-article/doi/10.1093/cid/ciad582/7285011