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20世纪70年代以来,艾滋病等新传染病的不断出现特别引人瞩目。①新发现的传染病种类之多令人惊异,20多年来新发现的传染病已30多种,几乎每年都至少有一种新传染病被发现。②新传染病给人类健康带来了严重的危害。艾滋病已成为人类的头号杀手;莱姆病遍及五大洲几十个国家,在美国
The continuous emergence of new infectious diseases such as AIDS has drawn special attention since the 1970s. (1) The number of newly discovered infectious diseases is astounding. Over 30 newly discovered infectious diseases in more than 20 years have seen at least one new infectious disease occurring every year. ② new infectious diseases have brought serious harm to human health. AIDS has become the number one killer of mankind; Lyme disease spreads in dozens of countries on five continents,