Tamil Nadu's first case of covid-19 Omicron BA. 4 sub lineage variant is a teenager and a part of a four-member family with no travel history and had taken two jabs of the vaccine against the virus.

The 19-year-old college student from neighbouring Chengalpattu district, who had contracted Omicron BA. 4 sub lineage variant has fully recovered and this strain has not spread to other parts of Tamil Nadu, state Health and Family Welfare Principal Secretary Dr J Radhakrishnan said on Monday.