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Researchers began to knew a new illness name AIDS which have appeared in the United States in 1982. U.S. government and medical experts have at least three reasons for react slowly to AIDS. Many medical experts didn’t realize it was a new disease. And U.S. Government didn’t want to talk about the new disease because it seems cause by people’s behaviours. Though some researchers began to let people knows the basic information about AIDS about how did the disease spread. AIDS still spread very quickly in America and it become a global problem the end of twentieth century. That makes researchers have to found some way to treat and prevent AIDS. But most of researchers didn’t think they could get an effective treatment to cure this disease in the future. Because It hard to give a lesson to prevent AIDS, people don’t want to speak openly about their sexual behaviour.And the most difficult thing is the cost of it is too high. It is very hard to change peoples attitudes about AIDS because most people doesn’t think they will get AIDS because they are not homosexual. Researchers thinks it will be easy to develop the prevention program if every people will understand the dangerous of AIDS.

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