China reports cases of a new, more transmissible Delta strain, 'sub-lineage AY.4'

COVID-19 New Delta Strain: In China, 138 locally-transmitted cases of COVID-19 have been confirmed in Zhejiang Province. These cases are said to be from the new Delta strain, "sub-lineage AY.4", prompting authorities in the province to bar millions of people from travelling to other parts of the country.

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