North Korea on Friday reported its first Covid-19 death a day after first acknowledging an outbreak of the virus. State news agency KCNA reported six deaths from a wave of fast-spreading fever, one of whom had tested positive for the Omicron variant of the coronavirus. The agency reported that, starting in April, more than 350,000 people presented with a fever “in a short span of time,” adding that at least 162,200 of them had since “healed completely.” The agency said the cause of the fever “couldn’t be identified” and said it “explosively spread nationwide.” It was not clear how many people …