Authorities have called on citizens not to travel, ordered schools closed a week early and conducted testing on a massive scale.
China has recorded 87,536 total cases of the virus, including 4,634 deaths.
Hospitals are currently treating 673 people for Covid-19, while 506 others are in isolation and under observation after testing positive without showing symptoms, officials said.
The Hebei outbreak has raised particular concern because of the province’s proximity to Beijing.
Parts of the province are under lockdown and interprovincial travel has been largely cut off, with those entering Beijing to work having to show proof of employment and a clean bill of health.
Beijing has also seen a handful of new cases, prompting authorities to lock down some suburban communities and require residents to show negative test results to access grocery stores and other public spaces.
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