In order to identify the source of infection of 19th confirmed cases of coronavirus disease 2019 (COVID-19) in Taiwan, the Central Epidemic Command Center (CECC) tracked down a Taiwanese businessman who returned from Zhejiang, China January 22, and developed respiratory symptoms and sought medical attention several times, the CECC indicated. After collecting his/her blood sample and sending it to the National Taiwan University Hospital and Academia Sinica for antibody tests, the CECC confirmed today to have found viral antibodies in the Taiwanese businessman and pointed out that the 19th case contracted the virus from the businessman.