The newly emerged recombinant coronavirus variant XBB.1.16 has been observed in different parts of the country, accounting for 38.2 per cent of the infection till date, according to the latest INSACOG bulletin. The bulletin of March 27, which was released on Thursday, said among the samples collected till the third week of March 2023, XBB continued to be the most commonly circulating Omicron sublineages. Noting that Omicron and its sublineages continue to be the dominant variants in India, the bulletin said an increase in infection rate has been observed, especially in western, southern and northern parts of India.