The deceased was identified as Jahangir Shikdar, 32, son of Abdul Majid Shikdar of Chhotosoula village in Mathbaria upazila.
Health and Family Planning Officer of Mathbaria Ali Hasan said the youth was admitted to Upazila Health Complex on Saturday and later sent to the Barishal hospital as his condition deteriorated.
He died at the isolation ward of the hospital on Sunday morning, he said, adding that his sample was collected for coronavirus test.
Superintendent of Police Hayatul Islam said two houses of the village were put under lockdown after his death.
Meanwhile, seven more people died from coronavirus in Bangladesh in the last 24 hours on Sunday, taking the death toll in the country to 91.
Besides, 312 more people tested positive for coronavirus during the period, raising the number of such cases in the country to 2,456.