The Wu Han data was estimated to be 1.4% of the infected population, and Wu Han was the worst data out of China. The rest of China is still estimated at about 0.16% ~ 0.14%. Italy was over 7%, but they are an outlier due to various other issues.
It seems that there may be a high correlation with severity of the disease and obesity, and U. S has one of the highest obesity rates of any country in the world, and highest diabetes rates.
We may therefore have a large population at a high risk, as compared to other countries.