faceman
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They have a particular variant of concern. the B.1.617 strain.
There's also been some concern about that spreading, there's been around 100 cases of it detected in the UK now (almost all relating to travel because the UK is only adding India to the 'red list' banning travel/requiring quarantine this Friday; at the moment anyone can still fly straight to the UK from India and is only asked to to self-isolate for 10 days). https://www.bbc.co.uk/news/uk-56813025
But as I understand it, it's not yet clear whether that variant is driving the surge partially or entirely, or whether it's more down to the complacency that allowed mass gatherings; India reopened workplaces, markets, shops, and have been allowing large weddings, festivals, election rallies, etc.
Something to watch for sure though.
Covid-19: UK finds 77 cases of B.1.617 variant first found in India
The B.1.617 strain's mutations are feared to make the variant spread faster and partially evade immunity.The variant is believed to be largely responsible for India’s current second Covid-19 wave, with infection rates and hospitalisations on the rise once again
www.livemint.com
This article says the variant you mentioned may be the main cause .