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All you need to know about symptoms and risks

Countries around the world are stepping up efforts to tackle a new coronavirus that originated in China's Wuhan city.

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What is coronavirus?

According to the WHO, coronaviruses are a family of viruses that cause illnesses ranging from the common cold to more severe diseases such as severe acute respiratory syndrome (SARS) and the Middle East respiratory syndrome (MERS).

These viruses were originally transmitted between animals and people. SARS, for instance, was transmitted from civet cats to humans while MERS moved to humans from a type of camel.

Several known coronaviruses are circulating in animals that have not yet infected humans.

The name coronavirus comes from the Latin word corona, meaning crown or halo. Under an electron microscope, the image of the virus looks like a solar corona.

The novel coronavirus, identified by Chinese authorities on January 7 and since named COVID-19, is a new strain that had not been previously identified in humans. Little is known about it, although human-to-human transmission has been confirmed.