HONG KONG—Local officials in the Chinese city of Wuhan, the original center of the Covid-19 pandemic, are scrambling to meet government demands for a massive round of coronavirus testing following the discovery of a new cluster of infections.

The orders came after six residents of a residential compound in western Wuhan were confirmed infected with the coronavirus over the weekend, ending a 35-day streak without any new cases. The discovery led to the firing of a local official in charge of the neighborhood.

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