The Chinese commercial hub of Shanghai will carry out mass testing for COVID-19 in seven districts over the weekend, a local health official said on Thursday.

The districts to be tested are Pudong, Huangpu, Jingan, Xuhui, Hongkou, Baoshan and Minhang, the deputy director of Shanghai's health commission, Zhao Dandan, told a media briefing.

Shanghai, a city of 25 million people, has a total of 16 districts. (Reporting by Ryan Woo Editing by Gareth Jones)