As many as 15 new cases of COVID-19 sub-variant JN.1 have been detected in Mumbai this week so far, city civic officials said on Wednesday, reported news agency PTI.

Daksha Shah, executive health officer, Brihanmumbai Municipal Corporation (BMC), said 19 swab samples tested positive for the JN.1 sub-variant during whole genome sequencing (WGS) and four of them were out of the metropolis, reported PTI.