New Delhi, June 18 -- The National Institute of Virology (NIV), Pune, announced on Wednesday that it has successfully sequenced and isolated four new sub-variants of the Omicron coronavirus variant. These sub-variants are believed to be driving the recent rise in Covid-19 cases across India.

Dr Naveen Kumar, director of the Pune-based NIV under the Indian Council of Medical Research (ICMR), explained that genome sequencing of samples collected nationwide revealed four distinct Omicron sub-variants: LF.7, XFG, JN.1.16, and NB.1.8.1.

Genomic analysis indicated that the surge in Covid infections was initially caused by the JN.1.16 sub-lineage of Omicron. However, since May, this has been largely replaced by the recombinant XFG variant, whi...