With updated numbers as of March 25, 2020 (note the slight uptick in mortality rate):
According to NY Times, for every confirmed coronavirus case, there are five to ten undetected cases out there.
https://www.nytimes.com/2020/03/16/h...ndetected.html
The latest US mortality rate derived from worldometer website is
1.4%.
https://www.worldometers.info/coronavirus/country/us/
If you account for undetected cases, the coronavirus mortality rate drops by a factor of five or ten - giving us actual mortality rate of
0.14% to 0.28%.
Seasonal flu mortality rate was given as
0.1% earlier in this thread.
R0 or basic reproduction number (also called basic reproduction ratio) measures the "contagiousness" of a disease.
Covid-19 has estimated R0 of
2.2.
https://www.ncbi.nlm.nih.gov/books/NBK554776/
Seasonal flu has estimated mean R0 of
1.3.
https://www.ncbi.nlm.nih.gov/pubmed/19545404
CDC estimates that so far this season there have been at least 38 million flu illnesses, 390,000 hospitalizations and
23,000 deaths from flu.
https://www.cdc.gov/flu/weekly/index.htm
According to worldometer website, US has had
928 deaths from coronavirus so far.
https://www.worldometers.info/coronavirus/country/us/