National Taiwan University Hospital
The first cases of atypical pneumonia in Taiwan were identified in a Guangdong-based businessman and his wife on 14 March and confirmed on 17 March. He had returned to Taiwan via Hong Kong on 23 February and reported a fever two days later. His wife became ill after caring for him, and both were admitted to National Taiwan University Hospital. Taiwan's third case of the disease was identified in a Yilan hospital on 15 March. Like the first case, the third case had traveled to Guangdong and transited through Hong Kong before arriving in Taiwan. Shortly after the third case was diagnosed, officials from the Centers for Disease Control and Prevention in the United States traveled to Taiwan to study the disease. The fourth case, another traveler to Guangdong, was identified in Chiayi on 18 March, after he sought treatment at a hospital the previous day. By 22 March, six cases in Taiwan had matched the World Health Organization definition of probable.