Time for some context.
The NEJM article posted above was a study, in China, of patients who tested positive after being hospitalized for their symptoms in December. It isn't even a complete data set, in that they only received data on less than 15% of those patients.
This is going to introduce certain biases into this study. First, you're only looking at the sickest of these patients, since it only includes data on patients ill enough to be hospitalized. Even then, the ICU admission rate was 5%, intubation and ventilation about half of that, and mortality rate was 1.4%.
If this is a representative sample of all patients hospitalized in China with COVID19 - and it's hard to know if it is - then the actual percentages are much much lower, since not every person who contracts the virus is hospitalized.
It's also important to remember the context of location. Everything I've read indicates COVID19 emerged in a densely packed population area, in a province in China that may not have the health resources of your average American city. Do the Chinese seek out medical care when sick as Americans do? Did they only present once farther along in the disease? Would these patients have done better in an American hospital?
It is an unknown, which is why people are freaking out about it. It's a great example of the focusing illusion. The more you hear about something, the greater importance it takes in your mind. I guarantee that people wouldn't be nearly as freaked out about this if it weren't for media attention.
Now, I'll defer to people better suited than I am to discuss the upcoming market effects of this.
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