GUANGZHOU, China — The southern Chinese city of Guangzhou has reported zero new locally transmitted coronavirus cases for the first time since a new cluster of cases cropped up in May.

The recent uptick in cases prompted mass testing and lockdowns, and also threatened global trade.

On Tuesday, health authorities found no new confirmed cases in Guangzhou, a city of over 15 million people which became China's new Covid hotspot.

The first new case, a 75-year-old woman, was detected on May 21. It was the first time the delta variant of the virus, first identified in India, was detected in China.

Authorities were concerned because of the highly transmissible nature of the variant and took action swiftly.

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