The video linked to below concerns COVID-19 testing companies in China who, shortly after moving to an area, always find lots of COVID-19 cases. Some are suspicious that, with the average Chinese person being subjected to between 7 and 10 tests per week, it may be in some people's interest to rustle up a bit of trade to help the bottom line.
https://www.youtube.com/watch?v=B4Ku54pLAo8
17 minutes
How would they test for it?
Processing millions or 10s of millions of "PCR" tests daily? And the PCR test is completely bogus too.
So, imo, it's all made up cases based on processing "social credit scores" and using the "emergency" to facilitate rounding up and disappearing potential trouble makers.