South Korea says defector who fled to North 'did not have' Covid-19

South Korea has said that a defector who recently fled to the North does not appear to have contracted Covid-19, a day after Pyongyang imposed a lockdown near the border, claiming the man was its first recorded case of the illness. North Korean state media reported on Sunday that the 24-year-old man, who was reportedly in quarantine, was displaying symptoms of coronavirus after returning to his homeland across the border separating the two Koreas last week.