BEIJING, May 9 (Xinhua) - All of the 52 new confirmed imported COVID-19 cases reported in the Chinese mainland during the past 14 days entered the country via airports, a health official said on Saturday.

Medical staff of Xiaotangshan Hospital disinfect a ward after the hospital cleared all COVID-19 cases in Beijing, capital of China, April 28, 2020. (Photo: Xinhua)

The continuing outbreak of the pandemic overseas has increased the pressure on China to prevent imported cases, said Mi Feng, a spokesperson for the National Health Commission, at a press conference in Beijing.

"We need to expand testing on those entering China to prevent a rebound of the epidemic," he added.