As of 23 January , the number of laboratory-confirmed cases stands at 593 , including 581 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 , the number of confirmed cases was more than 590 , and more than 575 of those were in mainland China .