"How does the Wuhan coronavirus cause severe illness?

Passengers wearing masks to prevent contracting coronavirus walk past a thermal camera upon their arrival at Incheon International Airport in Incheon
"We usually think of viral respiratory infections, like the common cold, as mild nuisances that pass in a few days. But the Wuhan coronavirus has proven to be different. Of those infected, around 2% are reported to have died but the true mortality is

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