China's top Covid official and multiple cities have signaled a possible relaxing of the country's strict zero-tolerance approach to the virus, after nationwide protests calling for an end to lockdowns and greater political freedom.

Anger over China's zero-Covid policy — which involves mass lockdowns, constant testing, and quarantines even for people who are not infected — has sparked protests in major cities, including Beijing, Shanghai, and Guangzhou.

But while authorities have called for a "crackdown" in the wake of the demonstrations, they have also begun hinting that a relaxation of the hardline virus strategy could be in the works.

Speaking at the National Health Commission Wednesday, Vice Premier Sun Chunlan said the Omicron variant was weakening and vaccination rates were improving, according to the state-run Xinhua news agency.

Sun — a central figure behind Beijing's pandemic response — said this "new situation" required "new tasks".

She made no mention of the zero-Covid policy in her latest remarks, suggesting an approach that has disrupted the economy and daily life might soon be relaxed.

The comments came as the Chinese capital said it would scale back daily testing requirements — a tedious mainstay of life under zero-Covid.

The elderly, those who work from home, students, and teachers in online education and others who do not leave home frequently are now exempt from daily tests, Xu Hejian, a spokesman for the Beijing Municipal Government, said Wednesday.

Beijing residents still require a negative Covid test taken within 48 hours to enter public places such as cafes, restaurants, and shopping malls, however.

And a report by the state-owned Southern Metropolis Daily Thursday said that local officials in Beijing and Guangzhou were planning to allow some positive Covid cases to quarantine at home instead of at state-run facilities.

The report was later deleted, and AFP requests for confirmation from local authorities in those cities went unanswered.