I work in the healthcare field. Here's the problem, we are testing people for any strain of a Coronavirus. Not specifically for COVID-19. There are no reliable tests for a specific COVID-19 virus.
The ‘gold standard’ in testing for COVID-19 is laboratory isolated/purified coronavirus particles free from any contaminants and particles that look like viruses but are not,
If you feel sick and get a PCR test any random virus DNA might be identified even if they aren’t at all involved in your sickness which leads to false diagnosis. And coronavirus are incredibly common.
All you need to do is select the sickest of these in a single location – say Wuhan – administer PCR tests to them and claim anyone..
Since you already selected the sickest flu cases a fairly high proportion of your sample will go on to die.