Mainland China saw a doubling in new coronavirus cases, including one in the central city of Wuhan, where the pandemic started late in 2019.
Infected travellers arriving from abroad caused the jump in cases.
And for the first time in days, locally transmitted cases crept into the daily tally. .
China had 78 new cases on Monday, the National Health Commission said, a two-fold increase from a day earlier.
Of the new cases, 74 were imported infections, up from 39 a day earlier.
Wuhan, capital of Hubei province and epicentre of the outbreak in China, reported one new case, the National Health Commission said on Tuesday, following five days of no new infections.
Other parts of the country reported local infections.