On Christmas Day last year, a 68-year-old woman in southern China came down with the flu. A week later she was hospitalized.
The woman eventually recovered, but she spent three weeks in the hospital.
The culprit? H7N4, a new type of bird flu.
"This is the first case of human infection with avian influenza A (H7N4) in the world," the Hong Kong Centre for Health Protection said Wednesday in a statement.