BEIJING — China's risk of COVID-19 cluster infections caused by sporadic cases cannot be ignored although the epidemic is in a generally stable state in the country at the moment, a health official said on May 13.

The newly reported six confirmed domestically transmitted cases in the Chinese mainland on May 12 were all related to previous cluster infections, said Song Shuli, a spokesperson for the National Health Commission, at a press conference in Beijing.

"We need to stay alert and put in place measures for regular epidemic response to resolutely prevent new outbreaks," she added.