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.
The number of laboratory-confirmed coronavirus cases during the pandemic stood at less than 550 , including less than 545 in mainland China on January 22 .