HYDERABAD : There may be at least six lakh people in the city who have been infected by coronavirus with a large number of them asymptomatic and need no hospitalisation, a study said on Wednesday.Conducted by CSIR-Centre for Cellular and Molecular Biology and CSIR-Indian Institute of Chemical Technology, the study said individuals infected by SARS-CoV-2 shed virus not only through nasal and oral routes but also through faeces.In a joint effort, CCMB and IICT harvested the sewage samples of different sewage treatment plants (STPs) in the city to estimate the number of potentially infected individuals, it said.According to the study, 80% of the STPs revealed nearly two lakh people are shedding viral materials and only 40% of the sewage reach.