People wear face masks as they wait for arriving passengers at Beijing Capital International Airport in Beijing on January 23. Mark Schiefelbein/AP

Regional health authorities in China have confirmed 13 new cases of the Wuhan coronavirus, bringing the total number of cases in mainland China to 611.

Eight more cases were confirmed in Beijing. Shaanxi Province and the Xinjiang Autonomous Region confirmed three and two cases, respectively.

Those are the first cases that have been confirmed in Xinjiang and Shaanxi -- meaning that of the 22 provinces, five autonomous regions, two special administrative regions and four municipalities under the control of the People's Republic of China, only five have not reported confirmed cases of the Wuhan coronavirus as of midday Thursday.

They are:

Inner Mongolia Autonomous Region

Tibet Autonomous Region

Gansu Province

Qinghai Province

Hong Kong

The Hong Kong government has not formally confirmed the presence of the virus in the city, but said it is investigating two "highly suspected" cases. Preliminary tests of the first individual were positive for the virus.

The self-governing island of Taiwan has reported a confirmed case of the coronavirus.