Normally corona viruses are a family of viruses that have led to respiratory infections (related to the breathing system) in human beings. Usually, these infections are mild to moderate. The viruses have a shape of a crown, hence are named after the Latin word Corona, which means crown.The corona viruses have also been known to affect birds and other mammals.As early as 2002 however, there was a strain called SARS-CoV that led to severe acute respiratory syndrome (SARS) in humans. Currently, the disease COVID-19 is related to a strain called SARS-CoV-2, which came up towards the end of 2019 and is transmitted by infected persons (whether they show symptoms or not). How the first transmission occured is still not clear but the real cause behind the disease is scientifically the virus SARS-CoV-2
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