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四、阅读理解 第一篇： New Attempts to Eradicate AIDS Virus A high-profile attempt to eradicate the AIDS virus in a few patients continues to show promise. But researchers wont know for a year or more whether it will work, scientist David Ho told journalists here Wednesday for the Fourth Conference in Viruses and Infections. This is a study thats in progress, says Ho, head of the Aaron Diamond AIDS Research Center, New York. The study involves 20 people who started combinations of anti-HIV drugs very early in the course of the disease, within 90 days of their infections. Theyve been treated for up to 18 months. Four others have dropped out because of side effects or problems complying with the exacting drug system. The drugs have knocked the AIDS virus down to undetectable levels in the blood of all remaining patients. And, in the latest development, scientists have now tested lymph nodes and semen from a few patients and found no virus reproducing there, Ho says. Bear in mind that undetectable does not equal absent, Ho says. Ho has calculated that the drugs should be able to wipe out remaining virusesat least from known reservoirs throughout the bodyin two to three years. But the only way to prove eradication would be to stop the drugs and see if the virus comes back. On Wednesday, Ho said he wouldnt ask any patient to consider that step before 2 (1/2) years of treatment. | 
