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What is a coronavirus?

Coronaviruses are a large family of viruses with some causing less-severe disease, such as the common cold, and others causing more severe disease such as Middle East Respiratory Syndrome (MERS), which caused an outbreak in 2012 and Severe Acute Respiratory Syndrome (SARS) coronaviruses, which also caused an outbreak back in 2002. Sustained human-to-human transmission has been reported - occurring in close contacts of infected patients and healthcare workers.