Eighty per cent of the samples taken from those who died of COVID-19 in Delhi till February 22 this year had the Omicron variant, according to government data. Genome sequencing of 239 samples collected from the deceased showed 191 of them with the Omicron variant. The remaining 48 (20 per cent) had other variants of COVID-19, including Delta which fuelled the ferocious second wave of infections in April and May last year, and sub lineages.