Construction workers are seen at Beijing Xiaotangshan Hospital, on Jan 30, 2020. [Photo by Wei Xiaohao/chinadaily.com.cn]

The world's largest medical complex devoted to SARS patients, it was built in only six days in April 2003.

About 7,000 workers built the hospital on a site covering 25,000 square meters in the northern outskirts of Beijing.

Gao Xiaojun, spokesperson for Beijing's health commission, said imported cases are the lion's share of confirmed cases in Beijing, and the number of secondary infections is increasing.