The WHO has just declared the coronavirus outbreak a public health emergency of international concern.

There have been nearly 10,000 cases of the so-called 2019-nCoV in China, 23 countries affected and more than 213 deaths globally.

China, Germany, the US and several other countries have confirmed the virus can spread person to person, even from people without any symptoms.

Now, there are reports of face mask shortages around the world, including Australia, the US and in many cities of China.