Flu is not a coronavirus, while common Cold virus are.
This is a novel virus for humanity, only recently it made the species jump from presumably bats to humans. No one has ever encountered it yet, there is no herd immunity against it reducing its spread from person to person. It is airborne transmisible, and asymptomatic or presymptomatics can infect a large number of people without even knowing they are infected. All this can account for its high rate of contagious.
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