China's Wuhan to test all 12 million residents as Delta variant spreads | The World

China is struggling to contain a widening coronavirus outbreak, which has spread to at least 15 provinces. Authorities in Wuhan, where the virus first surfaced in 2019, say its entire population will be tested. It comes a day after the city reported seven cases among migrant workers. China correspondent Bill Birtles tells The World about the extensive testing underway.

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