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2008年文登学校春季词汇班精彩文篇推荐(十) rar [共1集]

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更新时间：2008-02-21

来源博源网：

An AIDS Mystery Solved

(1) About 15 years ago, a well-meaning man donated blood to the Red Cross in Sydney, Australia, not knowing he has been exposed to HIV-1, the virus that causes AIDS. Much later, public-health officials learned that some of the people who got transfusions? containing his blood had become infected with the same virus; presumably they were almost sure to die. But as six years stretched to 10, then to 14, the anxiety of health officials gave way to astonishment. Although two of the recipients have died from other causes, not one of the seven people known to have received transfusions of the man’s contaminated blood has come down with AIDS. More telling still, the donor, a sexually active homosexual, is also healthy. In fact his immune system remains as robust as if he had never tangled with HIV at all. What could explain such unexpected good fortune?

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