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.

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

The UK Health Security Agency, a public health protection body, said AY.4.2, which was last week seen in six percent of cases, had been "designated as a variant under investigation" but not yet a "variant of concern".

United Kingdom: Health experts probe Delta subvariant after rise in Covid cases

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

United Kingdom: Health experts probe Delta subvariant after rise in Covid cases