Oishee Zaman, daughter of the former general secretary of Khulna district unit of Bangladesh Medical Association (BMA) Dr Akhtaruzzaman, died of coronavirus at a corona dedicated hospital on Tuesday noon.   Oishee Zaman, 30, had been undergoing treatment at the hospital since July 4 after she tested positive for coronavirus, said Dr Akhtaruzzaman.   The death toll from coronavirus in Bangladesh rose to 2,151on Tuesday as the health authorities confirmed  the death of 55 more patients in a span of 24 hours.   Besides, 3,027 new Covid-19 cases were detected after testing 13,173  samples, taking the total confirmed coronavirus cases to 1,68,645 as of Tuesday.