The death of a Covid-19 patient and a BMC worker testing positive from Mumbai's Dharavi has exposed its residents to the vulnerability of contracting the viral infection and sparked a fear of its spread in one of the biggest slums in Asia. On Thursday, a 52-year-old BMC sanitization worker was found positive for the virus. On Wennesday, authorities sealed the building where the deceased man lived and put all the residents in home quarantine. Several smallscale industries and workshops of leather goods, pottery and textiles operate from the slum colony, which has a population of about 15 lakhs and is spread over 613 acres. The area has been demarcated as a 'containment zone'. A civic official said they have also planned periodic spraying of disinfectants in the area, while the police have restricted people's movement there.