From Time: June 3, 2020
Wuhan Tests Nearly 10 Million People in 19 Days, Finding Just 300 Coronavirus Infections
(BEIJING) — The Chinese city of Wuhan, where the coronavirus was first detected late last year, has tested nearly 10 million people in an unprecedented 19-day campaign to check an entire city.
It identified just 300 positive cases, all of whom had no symptoms. The city found no infections among 1,174 close contacts of the people who tested positive, suggesting they were not spreading it easily to others.
Given what's happening in the US and other places in the world, I personally don't believe this number. But, this is what Time says, I just report it.