As of 23 January , the number of laboratory-confirmed cases stands at 581 , including 569 in mainland China , 4 in Thailand , 2 in Hong Kong , 2 in Macau , one in Japan , one in South Korea , one in Taiwan and one in the United States.
As of 23 January 2020 , the number of confirmed cases was less than 590 , and less than 575 of those were in mainland China .