Ignore the people telling you it's 2-3%. The case fatality ratio is between 9 and 56% according to proper epidemiological methods, such as using the formula "deaths / (deaths + recoveries)": https://mobile.twitter.com/zorinaq/status/122242770872387993...
e₂(s)=D(s)/{D(s)+R(s)} which is: deaths / (deaths + recoveries)
The paper concludes: "The second simple estimate based on the ratio of deaths of those for whom the outcome is known, e₂, is reasonable at most points in the epidemic" ie. produces a good estimate of the eventual observed case fatality rate (in fact in their example it slightly underestimates the actual case fatality rate)
Disclosure: no I'm not an epidemiologist. But for a reference to a paper by actual epidemiologists see https://pdfs.semanticscholar.org/ebf2/48c9fc0a1a23d1778b9408... section Simple Estimators, specifically this formula:
e₂(s)=D(s)/{D(s)+R(s)} which is: deaths / (deaths + recoveries)
The paper concludes: "The second simple estimate based on the ratio of deaths of those for whom the outcome is known, e₂, is reasonable at most points in the epidemic" ie. produces a good estimate of the eventual observed case fatality rate (in fact in their example it slightly underestimates the actual case fatality rate)