Three expainations why the covid19 pandemic is regarded as a health crisis
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1) covid 19 is caused by a virus which we know has a very high multiplication rate 2) it's a heavy virus which settles on surfaces so anyone touching the surface will get the infection 3) it has a viability period of3 to 7 days on different surfaces 4) being a virus it mutates it's genome so it's difficult to prepare a vaccine
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