The so-called Indian variant B.1.617 is split into sub-lineages, of which the B.1.617.2 variant of concern becomes Delta. The B.1.617.1 variant of int
According to the WHO, B.1.617 sub-lineages appear to have higher rates of transmission, including observed rapid increases in prevalence in multiple c
Soumya Swaminathan, a paediatrician and clinical scientist, said the B.1.617 variant of Covid-19, which was first detected in India last October, was