“We sequenced all samples of vaccination-breakthrough cases at NCDC, Delhi, over the period of the study. Two VOC lineages were seen amongst 27 cases: B.1.617.1 (n=2; 8%), B.1.617.2  (n=19; 76%). Other samples had the background B.1 lineages (16%).

It is noted that when compared to population prevalence, B.1.617.2 was over-represented and B.1.1.7 was not even detected in vaccination breakthroughs, suggesting higher breakthrough risk of B.1.617.2 compared to B.1.1.7.”

Preprint: Genomic characterization and Epidemiology of an emerging SARS-CoV-2 variant in Delhi, India

UK: government risk assessment of coronavirus Delta variant B.1.617.2 – evidence of frequent vaccine failure or decreased effectiveness in humans * UPDATED *

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