In 1997, the death of a three-year-old boy in Hong Kong raised the curtain on "human bird flu." The child died of acute pneumonia after being infected with the H5N1 strain of the influenza A virus, which had previously only affected poultry.
一九九七年，一名香港三歲小男孩之死，揭開了「人類禽流感」的序幕，這名小男孩感染了原本只侵犯家禽的 H5N1 型病毒，並因嚴重的肺炎症狀去世。