Two mango traders of Laxmipur district have been infected with the Delta strain of Coronavirus, which was first found in India, said Civil Surgeon Dr Abdul Gaffar on Tuesday. Dr Abdul Gaffar said the two people, who tested Covid-19 positive, returned from Chapainawabganj with mangoes few days ago. Read: Covid surge: Strict restrictions imposed in Dinajpur Hili area for a week Both the traders fell sick after returning home from Chapainawabganj and then they tested positive for Covid-19, he said. Both of them were referred to Dhaka Medical College and Hospital as their condition started worsening, said Dr Abdu Gaffar. However, the samples of the two infected people were also sent to the Institute of Epidemiology Disease Control and Research (IEDCR). Read:14-day lockdown in Damurhuda to contain Covid spread Besides, the health authorities urged people to maintain health safety protocols to prevent rapid spread of the virus. In the past 24 hours, nine people were found infected with Covid-19 in the district, raising the total number to 3073. Read:Covid-19: 12 patients die at RMCH in a single day So far, 54  people have died of Covid while 80 more people died after showing Covid-19 symptoms in the district. The infection rate in the district is 17 percent.