Local administration  put the Chatmohor upazila here  under lockdown as a man was diagnosed with coronavirus for the first time in the district on Thursday.   Sarkar Mohamamd Raihan, Upazila Nirbahi Officer announced the decision  around 11 pm.   A resident  of the upazila, who recently came from Narayanganj district, tested positive for coronavirus on Thursday and he was sent to home quarantine, he said.   The local administration took the decision to prevent spread of coronavirus, he said.