New Delhi, May 2 (IANS): In a shocking development that sparked fears of local transmission, 41 persons residing in a single building in Kapashera in south-west Delhi have tested coronavirus positive.

"One lady had tested coronavirus positive on April 18. She was immediately shifted to hospital. But considering the density of people housed in the building's small rooms and common toilets, we contained the area for public good," south-west Delhi's District Magistrate Rahul Singh said on Saturday.

The incident was reported in Theke Wali Gali near the DC office in Kapashera. As per the guidelines, a containment zone is created if at least three positive cases are reported in a particular area.

"Samples of all residents of the building were collected and sent to National Institute of Biologicals, Noida. Of the test reports of 67 persons made available on Saturday, 40 tested corona positive," official sources said.

"The samples were collected on April 20 and 21 but due to closure of inter-state borders and high pendency with NIB, the results were delayed by around 10 days," the officer added.

The Delhi south-west district has till Saturday afternoon reported total of 110 cases, of which one person has died, 17 cured and discharged and 6 in quarantine.