据世界卫生组织(WHO)和联合国艾滋病规划署(UN-AIDS)统计到2003年底,全球感染HIV/AIDS活着的成人和儿童数将达到4 000万(范围3 400-4 600万)。其中2003年有近500万(其中70万是15岁以下的儿童)感染。HIV感染男女性之间分布不同,地区之间差别巨大。在非洲女性比男性感染多。总的来说,大多数HIV感染发生在中低收入的国家。而且,因为HIV无症状期很长,所以许 According to the statistics of the World Health Organization (WHO) and UN-AIDS, the number of adults and children living in the world with HIV / AIDS will reach 40 million by the end of 2003 (range 34.046 million). Of these, nearly 5 million (700,000 of whom were children under 15 years of age) were infected in 2003. HIV infection varies between men and women, with huge differences between regions. In Africa, women have more infections than men. In general, most HIV infections occur in low- and middle-income countries. And, because HIV is asymptomatic a long time, so maybe