As of 22 January , the number of laboratory-confirmed cases stands at 554 , including 543 in mainland China , 4 in Thailand , one in Japan , one in South Korea , one in Taiwan , one in Macau , two in Hong Kong and one in the United States.
Before January 23 , 2020 , there were less than 550 COVID-19 cases , including less than 545 in Mainland China .