Which study supports that number?
The world is still quite clueless about an accurate true cases guess.
I asked some pages back but nobody replied:
Why should we massively under-test asymptomatic infections?
4m+ UK tested, roughly 80m tests globally and what we find is that under 10% of mainly symptomatics are positive, while positive asymptomatics are under-represented in big numbers?
I would need to have a good reason to follow that idea.
There is a discussion on it here but it's wildly varied.
https://blogs.bmj.com/bmj/2020/05/0...a-asymptomatic-versus-symptomatic-infections/
Personally I see mild symptoms as the same thing because prior to the increased awareness very few people were tested or had any knowledge that they could have the virus.
Everyone I know seems to know someone who just after Xmas was wiped out by 'something' they've never had before.