What is the source of 2019-nCoV?

Public health officials and partners are working hard to identify the source of the 2019-nCoV. Coronaviruses are a large family of viruses, some causing illness in people and others that circulate among animals, including camels, cats and bats. Analysis of the genetic tree of this virus is ongoing to know the specific source of the virus. SARS, another coronavirus that emerged to infect people, came from civet cats, while MERS, another coronavirus that emerged to infect people, came from camels. More information about the source and spread of 2019-nCoV is available on the 2019-nCoV Situation Summary: Source and Spread of the Virus.

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1. What is the 2019 Novel Coronavirus (COVID-19)?
2. What is a novel coronavirus?
3. What is the source of 2019-nCoV?
4. How does the virus spread?
5. Is 2019-nCoV the same as the MERS-CoV or SARS virus?