It's not just India/UK/US.
B.1.617.2 gaining quickly in Japan, Singapore, Australia, NZ, & other countries, see https://t.co/t6RYIZYbFE
It combines the high infectiousness of B.1.1.7 and some immune evasion features not seen with that variant, which explains why 2nd dose is key

— Eric Topol (@EricTopol) May 27, 2021