A medical worker collects a swab from a man to conduct free nucleic acid tests for residents in the residential compound, after new cases of Covid-19 were found in Urumqi, Xinjiang province, China July 19, 2020. — Cnsphoto handout via Reuters
China is battling the most aggressive return of Covid-19 in months, driven by infections in the far western region of Xinjiang and a separate flare-up in the northeast. Xinjiang has yet to explain how patient zero, a 24-year-old woman who worked in a mall in its capital Urumqi, contracted the virus. To contain the spread of the virus, Xinjiang and Dalian have tested millions of people for Covid-19, but the coronavirus is already on the move.
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