Delta variant led to most post-vaccine infections in Delhi

The B.1.617.2 variant of Covid-19 also known as Delta Variant according to WHO nomenclature, constituted nearly three in four breakthrough infections in Delhi, according to a research study by scientists in Delhi.

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Breakthrough infections are instances of people testing positive for the virus after getting vaccinated.

The study also reports a new mutation in Delta called T478K that the scientists believe has a role to play in allowing the coronavirus to better infiltrate human cells.

However international variant Alpha, that in previous studies has been associated with a spike in cases in Delhi in February and March was absent in vaccination breakthrough-cases analysed.

Previous studies had shown that the farmer protests and religious gatherings had contributed to amplifying the Alpha variant in North India. The latter variant has now been outcompeted by the Delta.