The major manufacturing hub of Dongguan in China's most populous province of Guangdong has launched mass testing for the coronavirus and cordoned off communities after detecting its first infections in the current outbreak.

The Delta variant of Covid-19 has dominated infections in the provincial upsurge, the first time it has hit China. Dongguan launched its citywide testing programme following two cases reported since Friday.

Reuters reports city authorities have told residents not to leave, except for essential reasons. Even then, those leaving must show negative test results within 48 hours of departure.

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