Volunteers deliver necessities ordered by residents under home quarantine at a community in Haidian District, Beijing, capital of China, Aug. 3, 2021. One new locally-transmitted confirmed COVID-19 case was reported on Monday in a residential community in Haidian. The community has been put under closed management. (Xinhua/Ren Chao)

 Some internet and foreign firms based in Beijing have restarted the home-based working model due to a recent flare-up of COVID-19 infections. For companies that require working at the office, virus prevention measures have been enhanced, the Global Times has learned.

ByteDance, the owner of popular video-sharing platform TikTok, told the Global Times on Thursday that the company has half of its staff working on-site in some office buildings after receiving an official notice from the relevant department in Haidian district, northwest Beijing, where the company is based.

The district said in a notice on Tuesday that residents should travel less and work from home.

Beijing locked down six residential communities in its northwestern district of Haidian on Monday after finding one positive COVID-19 case there.

The capital city has reported nine COVID-19 patients since July 28 that are related to the latest round of Delta variant flare-up imported from the Nanjing Lukou International Airport.

The capital city has suspended train transportation from cities that have reported new cases.

Chinese search giant Baidu told the Global Times on Thursday that staff whose health apps are normal can come to the office, but virus prevention measures have been ramped up starting from Thursday.

Some companies near northeastern Beijing's Wangjing area, Chaoyang district, told their employees to work from home after the Guofeng Shangguan community was sealed off on Wednesday. A resident there was found to be coronavirus positive, a case that was related to the Nanjing outbreak.

An employee working at Wangjing-based Daimler told the Global Times on Thursday that he was told to work from home. An employee of a Swedish firm based in the 798 Art Zone near Wangjing received a similar notice.

The capital city imposed strict entry and exit controls on Sunday and is said to be at a "critical stage" of virus control after cases rose in late July. Parks resumed the 75-percent capacity cap and universities were closed to outsiders.

Chinese mainland reported on Thursday 85 new confirmed coronavirus cases for Wednesday, down from 96 reported a day earlier, according to the National Health Commission.