Chinese mainland's asymptomatic COVID-19 cases drop in past 10 days: official

Over the past 10 days, the number of asymptomatic COVID-19 cases still under medical observation dropped by 22 percent on the Chinese mainland, a health official said Thursday.

No more than 20 new asymptomatic cases have been reported each day over the period, said Song Shuli, a spokesperson for the National Health Commission, at a press conference in Beijing.

However, the official warned that close contacts of domestically transmitted cases are still increasing, requiring greater efforts in testing and screening to identify the infection sources and the scope of the virus spread as soon as possible so as to forestall any resurgence of infections.