Chinese health authorities announced on 23rd January that 571 confirmed cases of pneumonia caused by the novel coronavirus (2019-nCoV) had been reported in 25 provincial-level regions in the country by the end of 22nd January.

A total of 393 suspected cases have been reported, according to the National Health Commission (NHC). The pneumonia situation had resulted in 17 deaths, all in central China's Hubei Province. The deaths reported from the disease were aged between 48 and 89, according to the commission. It added that most of the patients who died had underlying health issues such as cirrhosis, diabetes, high blood pressure and coronary heart disease.

Overseas, one case has been confirmed in the regions of Hong Kong, Macao, Taiwan, as well as in the United States, Japan and the Republic of Korea respectively, and three in Thailand. A total of 5,897 close contacts have been traced, the commission said, adding that among them, 4,928 are under medical observation while 969 others have been discharged. Based on the current knowledge, the incubation period of the virus, the interval between infection to onset of symptoms, can be as long as about 14 days, according to a prevention and control plan released Wednesday by the NHC.