as being the unknown... what he really means is the denominator.
The numerator is always the deaths due to Covid-19 (not completely known but pretty well known especially in places like South Korea).
And I would submit that the denominator in South Korea is starting to be well known too... they test a *lot* more than we do (per capita)... and they are farther along in the pandemic (thanks to a rapid response, extensive testing, contact tracing, etc).
So the correct fatality rate is likely to be deaths / (deaths + recovered) or around 2.7%
We won't know the correct denominator until we get wide spread anti-body testing done on almost the entire population of South Korea and understand just how many people were infected, including those that never presented with symptoms.
But I think we can safely say the CFR is between 1.1 percent and 2.5 percent... which is incredibly high when compared to the flu... and why this virus is to be respected and feared by every living human being.
After all, if every person on earth eventually contracts this virus.. all 7.2B of us... a 2.5% CFR will be 180 million deaths. That is, unless we can vaccinate before everyone is infected.
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