Ten new residential areas have been quarantined in Beijing. The mayor of the Chinese capital announced this on Monday.
In the past 24 hours, 36 new cases of infection have been registered in the metropolis.
The authorities have discovered new cases of contamination in a wholesale market in the northwest of the capital, in the Haidian district. The market and nearby schools are closed.
Last week there was a virus outbreak at a substantial fresh produce market in the south of the city, in the Fengtai district. Eleven residential areas in this area have been locked down, and the market is closed.
The virus, which first appeared in Wuhan at the end of last year, seemed to have been primarily controlled since March due to a strict lockdown set early this year. But last weekend there was a revival in the number of infections.
The authorities have launched a massive screening of market workers and visitors, as well as residents of the Fengtai district. More than 10,000 people have now been tested.
In the past 24 hours, 49 new cases have been reported across the country, including 36 in Beijing. The capital has had 75 new cases of the infection since Friday.
Several cities in the country now advise their residents to avoid the city.