MUMBAI: Coming in the wake of the city’s 2,000-plus Covid-19 cases is another stark statistic. As many as 48,332 persons were under home quarantine as of Friday, of whom 3,913 have been shifted to institutional quarantine. The silver lining, as per the BMC's latest COVID-19 response report, is that 11,368 contacts of people who tested positive for the coronavirus have finished their fortnight-long quarantine.A BMC official said that only those who live in apartment blocks and have toilets within their flats have been kept in home quarantine. If a person who needs to be quarantined lives in a small home with “many others” and uses a community toilet, he or she is moved into an institutional quarantine facility.Those who have been home-quarantined are within 452 containment zones that the civic body has marked out in the city, the majority being in the worst-affected wards: G-South (Worli, Lower Parel, Prabhadevi and Mahalaxmi), E (Mazgaon, Nagpada and Byculla) and D (Tardeo, Girgaum, Walkeshwar , Malabar Hill and Altamont Road).On institutional quarantine, a BMC official said, “This was done for locals from Dharavi and Worli, who were moved into Rajiv Gandhi Sports Complex and Poddar Hospital, respectively, as keeping them in their own (crowded) homes would not have amounted to isolating them.”Meanwhile, the BMC is using video analytics for counting people and vehicles moving on the roads in the city’s 452 containment zones. Also being tracked are shops selling non-essential products. The BMC’s control room alerts local police stations if lockdown violations are noticed in the containment zones, and also gives an idea of the number of personnel needed to ensure enforcement.