As of 23 January , the number of laboratory-confirmed cases stands at 639 , including 627 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 , laboratory-confirmed tests in China were less than 630 , with less than 615 of those in mainland China .