The World Health Organization explains, "Coronaviruses (CoV) are a large family of viruses that cause illness ranging from the common cold to more severe diseases such as Middle East Respiratory Syndrome (MERS-CoV) and Severe Acute Respiratory Syndrome (SARS-CoV). A novel coronavirus (nCoV) is a new strain that has not been previously identified in humans."
The first cases of coronavirus disease 2019 (COVID-19) were reported December 1 in Wuhan, China. The coronavirus has now spread to 56 countries, caused 2,876 deaths and infected more than 84,000 people. The mortality rate is around 3%. The WHO declares the global risk to be "very high" but is hesitant to call COVID-19 a pandemic.