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by E14n 2292 days ago
I would assume its because the number of people with similar symptoms far exceeds the capacity to test for covid-19. If the numbers in this article[1] are accurate there were around 2.23 million people who went to the doctor for flu related symptoms from January 21 to 27, 2019.

1. https://www.nippon.com/en/japan-data/h00386/japan-gripped-by...