Until 1994 dengue fever had only occurred on a large scale in southern Taiwan. The central and northern part of the island had not been threatened. But in 1995 a case suddenly did crop up in Taipei County that drew serious attention from the Department of Health because it suggested that the disease was moving north.
直到一九九四年之前，登革熱的大幅度流行均發生在南部地區，中北部並未受到威脅，但一九九五年台北縣突然出現一名病例，引起衛生署高度重視，顯示登革病毒仍有北上流行之虞。