Three more people were diagnosed with coronavirus in the test conducted at Rajshahi Medical College Hospital (RMCH) on Sunday.
Of them, one is from Puthia upazila while the two others are from Sirajganj and Naogaon districts.
Civil Surgeon Dr Enamul Haque said so far 12 people have been found infected with Covid-19 in Rajshahi division.
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.