Mainland China reported 99 new coronavirus infections on April 11, more than doubling from the previous day to reach a one-month high, as the number of single-day imported cases hit a record, official data released on Sunday showed.

In addition, highlighting another major source of risk, newly reported asymptomatic coronavirus cases nearly doubled to 63 on April 11, from 34 the previous day, according to China's National Health Commission (NHC).

Almost all the new infections - the biggest daily count since March 6 - involve travelers from overseas. Just two out of the 99 cases were locally transmitted.