I should be more clear -- I don't mean most people are asymptomatic. Most people have MILD symptoms which they would not got the doctor for. Which under current testing methods, would NOT be tested in the United States. We are still only testing people who need to be treatment in many places! So we have a lot more cases than 180,000!
A good case example is the Diamond Princess cruise -- On the Diamond Princess Cruise, 18% of all INFECTED people on the ship had NO symptoms. I think the number of MILD symptoms might be even higher -- again which might not have been tested if they were in general population.
https://www.nature.com/articles/d41586-020-00885-w
And a recent study by the Lancet suggests that the case fatality rate is closer to 0.66% which is similar to Diamond Princess rate ~1%.
So right now, we probably have at LEAST 500,000 cases of COVID..we just don't know it. This started much early, we just didn't know it.
Was it here in December? That's probably early. But I just think it was interesting that we had a big spike in flu-like illnesses. Maybe that happens every year though? Not sure. Haven't looked at that yet.
I think it probably started earlier in China than anyone realizes, but how would we know...you can't trust any of that data.