Also Read | Inside the third front of the farm agitationThis variant spread so rapidly that in just 10 weeks between February and March 2020 over 64.11 per cent of globally infected individuals were identified to carry the mutant virus starting from only 1.95 per cent in January.However, the researchers, including those from the National Institute of Biomedical Genomics (NIBMG) in Kalyani, West Bengal, said this subtype took a significantly longer time to reach a 50 per cent relative frequency in East Asia -- 5.5 months -- compared to the 2.15 months it took in Europe, and the 2.83 months it took in North-America.According to the scientists, a deficiency of the protein Alpha-anti-trypsin (AAT) across the populations of Europe and.