Book 1,Unit 5,New Horizon College English,The Battle Against AIDS,Book 1,Unit 5,New Horizon College English,Acquired Immunodeficiency Syndrome (后天性免疫缺陷综合症) It is a disease that limits the bodys ability to fight infection. A person with AIDS has a very weak immune system, turning normally mild or rare diseases into potentially fatal conditions.,Book 1,Unit 5,New Horizon College English,Human Immunodeficiency Virus (人类免疫缺陷病毒) AIDS is different from HIV in that the former usually causes death whileHIV may lead to AIDS.,Book 1,Unit 5,New Horizon College English,HIV,AIDS,The progression from the initial HIV infection to AIDS may take six to ten years or more. During this time the HIV virus worksand eventually leads to AIDS itself. The HIV virus kill T-cells (一种在胸腺内分化的淋巴细胞) within the white blood cells, which are the major disease fighters in the body. It invades the cells and actually manages to replace their DNA so that the cells no longer produce new T-cells, but produce new HIV viruses instead.,Book 1,Unit 5,New Horizon College English,Book 1,Unit 5,New Horizon College English,Sometimes symptoms occur within one to three weeks after infection. These symptoms are the result of infections that develop because of the bodys weakened ability to fight them off. These are often flu-like, such as,fatiguefeverswollen lymph glandsdiarrheanight sweats,Book 1,Unit 5,New Horizon College English,Some evidence suggests that the HIV and AIDS epidemic began in Africa, although it is hard to detect exactly how and why. A few people even argue that it was passed to humans from monkeys, which were killed and then eaten. HIV did not become epidemic until the 1980s, perhaps because poor and young sexually active individual migrated from rural areas to urban centers in some countries. Their return to the countryside, coupled with international travel, tourism, and the international drug trade, helped spread the disease. By the mid-1980s, the world was aware of the deadliness of HIV and AIDS but there was a great deal of ignorance about the causes of the condition and how it was spread.,Book 1,Unit 5,New Horizon College English,Book 1,Unit 5,New Horizon College English,In high-prevalence areas, more than 60% of new infections occur among people aged 16 to 25.,33 million,6%,At the end of 2007, nearly 33 million people around the world carried the HIV virus.,Till the end of 2007, nearly 6% were kids.,25 million,Since 1981, over 25 million had died of AIDS throughout the world.,60%,47%,At the end of 2007, about 47% female were infected with AIDS.,0.2 million,In China, there are 0.2 million AIDS infectors till 2007.,Book 1,Unit 5,New Horizon College English,Book 1,Unit 5,New Horizon College English,Book 1,Unit 5,New Horizon College English,Book 1,Unit 5,New Horizon College English,There are several important ways that you cannot get HIV. You cannot get it from:,being bitten by insects or animals,Book 1,Unit 5,New Horizon College English,sharing most personal items with an HIV-infected person such as:,share a book,share a shaver,share eating utensils,share toilets,share clothes,Book 1,Unit 5,New Horizon College English,touching a person with HIV or AIDS,kiss,shake hands,hug,dance together,Book 1,Unit 5,New Horizon College English,eating food with an HIV-infected person or eating food that has been prepared by an HIV-infected person,Book 1,Unit 5,New Horizon College English,going to public places which have been occupied by HIV-infected people,swim in the pool,sit side by side,Book 1,Unit 5,New Horizon College English,This is the Red Ribbon. It is an international symbol(标志) of AIDS awareness. People wear the ribbon, particularly around World AIDS Day, to show care and concern(关注) about HIV and AIDS.,Book 1,Unit 5,New Horizon College English,World AIDS Day,December,1st was established as World AIDS Day in 1988. It is the only international day of coordinate action (协调行动) against AIDS.,Book 1,Unit 5,New Horizon College English,The End,Book 1,Unit 5,New Horizon College English,