半个世纪以来，现代医学越来越向两极发展，一极是微观方向，从细胞、基因水平上揭示疾病的起源及治疗方法；另一极是从人和自然其他种群间的则关关系的宏观水平来考察疾病的预防。而处于这两极间的那些疾病受人关注的程度有所下降，典型的情况是被称为世纪末疾病的寄生虫病。 For half a century, modern medicine has been developing towards bipolarity. One pole is the micro direction, revealing the origin and treatment of diseases at the cellular and genetic level. The other is from the relationship between man and other natural populations To examine the macro-level prevention of the disease. The degree of concern for those diseases that fall between these two poles has declined, typically as a parasitic disease known as end-century disease.