在发达国家HIV 感染的绝大多数是男同性恋者和静脉药瘾者。但在发展中国家,尤其是非洲和加勒比海国家,HIV 则主要由异性性交传播。据世界卫生组织估计,全球80%的HIV 是由异性传播的,随着流行的进展,在发达国家HIV 的异性传播显得越来越突出。1987年l2月底,美国有408名妇女感染HIV,占总感染人数的6.7%。到1990年12 The vast majority of HIV infections in developed countries are gay men and intravenous drug addicts. However, in developing countries, especially in Africa and the Caribbean, HIV is transmitted mainly by heterosexual intercourse. According to the World Health Organization, 80% of the global HIV transmission is by heterosexuality. As the epidemic progresses, heterosexual transmission of HIV in developed countries becomes more and more prominent. By the end of 1987, there were 408 women infected with HIV in the United States, accounting for 6.7% of the total number of people infected. By 1990 12