Most of the Omicron-infected patients during the last week of December 2021 had no travel history which indicates that there was eventual community transmission, according to the study conducted by the Department of Clinical Virology, Institute of Liver and Biliary Sciences, New Delhi. 

“The respiratory specimen of all RT-PCR confirmed positive cases between November 25 and December 23, 2021, collected from five districts of Delhi were subjected to whole-genome sequencing. Complete demographic and clinical details were also recorded. Hence, we analysed the formation of local and familial clusters and eventual community transmission,” the study noted.