Mumbai, Sept. 19 -- In the second wave, a significant proportion of Covid-19 infections were attributed to the highly transmissible Delta variant (lineage B.1.617.2). Whole-genome sequencing of over 15,000 samples done till August shows that the Delta variant is still predominant in the state. But data has revealed that 44% samples sequenced from the state last month were identified with the new sub-lineage of Delta variant-AY.4- which was higher than other variants. P2...