Epidemic flare-up in Northeast China's Heilongjiang Province has further fermented as COVID-19 spread to more nearby cities and counties beyond the capital city of Harbin over the weekend as the total positive COVID-19 infections rose to 40 in five days.

Public health experts said there is a need to strengthen epidemiological studies so as to cut off potential virus transmission among inter-provincial areas ahead of the upcoming National Day holidays.

To screen out more potential infections among residents, a third round of nucleic acid testing has been carried out starting from Sunday.

Harbin has registered a total of six medium-risk regions for COVID-19 and one high-risk region. 

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