A teenage girl who had been suffering from fever, cough and sore nose died at the isolation unit of Shaheed Shamsuddin Ahmed Hospital in Sylhet on Tuesday.   The deceased was identified as Julefa Begum, 16, hailing from Jalalpur village of Balaganj upazila.   Dr Premananda Mondal, civil surgeon of the district, said the girl died around 2pm just three hours after she was admitted to the hospital. “We’ll send throat swab of the deceased to Dhaka for test,” he added.     Meanwhile, Assistant Director of Sylhet MAG Osmani Medical College Hospital Dr Himangshu Lal Roy claimed the death to be a natural one.   “The body will be handed over to the family as per the regular practice,” he added.   Few days ago, an overseas returnee died while being treated at the isolation unit of the hospital. But she tested negative for Covid-19 later.