Starting with where it came from
The virus came to light late last year in a food market illegally selling wildlife in the Chinese city of Wuhan. Health experts think it may have originated in bats and then passed to humans, possibly via another animal species.
But just how dangerous is it?
The coronavirus is from a family of viruses that include the common cold and more serious diseases like SARS. Severe cases can cause pneumonia and death. But many of those who've died had pre-existing medical conditions, with weakened immune systems.
How exactly is it transmitted?
The virus can be shared via particles in the air most likely from coughing or sneezing. Touching an infected person or object also carries a risk. Most cases so far in Wuhan were among family members of those infected, or medical workers.
How can it be prevented?
The WHO recommends people frequently wash their hands, and cover their mouths and their noses when sneezing or coughing, and avoid close contact with those who are sick. The U.S. Centers for Disease Control and Prevention says anyone with symptoms who's been in China in the last 14 days should call a healthcare professional about getting tested.
Where has it spread so far?
The vast majority of cases have been in China, mostly in and around Wuhan. Other countries with confirmed cases range from France to the United States.
And this is what the authorities have done
(SOUNDBITE) (English) WHO DIRECTOR GENERAL, TEDROS ADHANOM GHEBREYESUS, SAYING:
"I'm declaring a public health emergency of international concern over the global outbreak of novel coronavirus."
Meanwhile, the Chinese government has put Wuhan in virtual quarantine to try to stop the spread of the virus.
