BEIJING — A Chinese health official warned on April 19 that some regions in China are seeing a growing number of clustered infections caused by imported cases of the novel coronavirus disease (COVID-19).

The Chinese mainland reported nine new imported COVID-19 cases on April 18, said Mi Feng, an official with the National Health Commission, at a press conference in Beijing.

Mi noted that it was the first time in a month that the number of daily imported cases had dropped below 10.

A complete management mechanism of testing, diagnosis, report and quarantine should be put in place, said Mi, calling for resolute efforts to curb virus transmission in communities.