Dr Osama was part of 10-member team of the doctors tasked with screening patients returning from downtowns, particularly those arriving there from Iran via Taftan. He later started providing services to the suspected patients in isolation centres established for them in Gilgit.
According to a news report by The News, Dr Shah Zaman, who had personally met Riaz, said:
After I met him at the screening centre, he later finished duty and went home. He was perfectly alright by that time and didn’t made any complaint but it was when his wife tried to awake him, he didn’t respond and when they checked, he was unconscious
Dr Osama was then shifted to the Provincial Headquarter Hospital (PHQ)in Gilgit city where he was put on ventilator. They sent his swab for investigation that confirmed him as positive case. According to officials in Gilgit, they repeated his swab test and again he tested positive for coronavirus. According to the doctors in the PHQ, they had sent his swab to the National Institute of Health in Islamabad for the satisfaction of his family. They removed him from ventilator on Sunday night and announced him dead. Dr Shah Zaman said they had constituted a board that investigated other aspects of his complications.