在历史的长河中 ,在不同时期、不同地域 ,均大小不等地流行过各种各样的传染病与寄生虫病 ,诸如天花、鼠疫等 ,曾严重地威胁人类的生存与发展。直至今日 ,人类与传染病及寄生虫病的斗争虽然取得了巨大的成就 ,但也出现了某些新问题。如被称为“世纪瘟疫”的获得性免疫缺陷综合 In the long history of our country, epidemics and parasitic diseases such as smallpox and plague have been prevalent in varying periods and in different regions and have threatened the survival and development of mankind seriously. Even today, the great successes of the human race in fighting infectious diseases and parasitic diseases have shown some new problems. Such as the acquired immunodeficiency syndrome called “Century Plague.”