Besides, 22 officials and staff of the branch have been sent to home quarantine, said Sadar upazila nirbahi officer Yeasmin Nahar Ruma.
Samples of four other officials who came in contact with the infected one have been collected for test, she added.
Sadar upazila health and family planning officer Dr Soumitra Chakraborty said that the official’s samples were sent to Sylhet lab on April 23 for test. They received the test result on Monday night.
The bank official is now undergoing treatment at Sunamganj 250-bed Sadar Hospital isolation ward, he added.
Confirmed coronavirus cases rose to 6,462 in Bangladesh on Tuesday after the health authorities reported 549 new cases and three fatalities.
During this period, three people died from coronavirus surging the total deaths to 155.