As of 23 January , the number of laboratory-confirmed cases stands at 650 , including 633 in Mainland China , 4 in Thailand , 3 in Hong Kong , 2 in Macau , 2 in Vietnam , one in Japan , one in South Korea , one in Taiwan , one in Saudi Arabia , one in Singapore and one in the United States .
By January 23 , 2020 , more than 632 people had tested positive for COVID-19 in mainland China .