A police and a child were among seven people diagnosed with coronavirus in the last 24 hours in Chattogram.   Soon after the test reports came in, Chattogram Metropolitan Police (CMP) locked down its north zone barrack on Sunday night.   The traffic constable had been undergoing treatment for the last five days at the divisional police hospital. He has now been shifted to Andarkilla General Hospital, said Dr Hasan Shahriar, Chattogram divisional director of the Directorate General of Health Services.