It seems more like a weapon than a disease.
Normally people who have symptoms are contagious. Not this one. People pass the virus before they know they have it.
People seem to be able to contract it twice, so there may be two strains.
No one seems sure how it is transmitted. So doctors are dying.
It may be crossing species barriers.
And it kills at a rate of up to 4%. It's not clear why some countries have it worse: Italy has a very well regarded health service, and it is getting the worst spread in Europe.
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