An outbreak of new coronavirus has sickened nearly 1,300 people and killed at least 41 in mainland China, while spreading to countries around the world.
Coronavirus is a large family of viruses, which include severe acute respiratory syndrome (SARS) and Middle East respiratory syndrome (MERS).
Common symptoms include a runny nose, cough, sore throat, and possibly a headache. Those who have a weakened immune system, particularly the young and the elderly, are at risk of the virus turning into a more serious respiratory tract illness.
Authorities in China have imposed indefinite travel restrictions in 11 cities in Hubei province, the most affected area in the country, impacting an estimated 32 million people.
Wuhan, a city of 11 million, is under effective lockdown, with all public transport in and out of the city closed.
Other cities across the province are under less severe travel restrictions. They include Ezhou, Huanggang, Chibi, Xiantao, Zhijiang, Qianjiang, Huangshi, Xianning, Yichang and Suizhou.