Coronavirus disease 2019, abbreviated as COVID-19, is an infectious disease caused by a novel coronavirus (SARS-CoV-2) not previously seen in humans. The virus responsible for the disease belongs within the same category of viruses (coronaviruses) that cause other mild upper-respiratory tract illnesses, like the common cold. It was first identified in December 2019 in Wuhan, China. Now, it is in almost every country in the world.

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