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  3. H1N1 Epidemic Trends The number of Americans being tested for the swine flu has plummeted, providing more evidence that the

H1N1 Epidemic Trends The number of Americans being tested for the swine flu has plummeted, providing more evidence that the

admin2013-07-08  75
问题                         H1N1 Epidemic Trends
    The number of Americans being tested for the swine flu has plummeted, providing more evidence that the second wave of H1 N1 infections has peaked in the United States, a medical testing company reported Friday.
    Quest Diagnostics Inc. ; the world’s leading diagnostic testing company, reported that an analysis of nearly 170,000 samples from patients between May 11 and Dec. 9 showed the number of tests declined 75 percent since hitting a peak in the middle of October.
    At the same time, the proportion of tests that are coming back positive for H1N1 has fallen, from 44 percent in November to only 21 percent for the two weeks ending Dec. 9. The new H1N1 virus continues to be the dominant virus causing influenza, the company reported. It said H1N1 accounts for 98 percent of positive flu samples.
    Positive tests have fallen for all age groups, but children age 5 to 14 continue to experience the highest percentage of H1N1 positive test results, Quest said. Nearly four in 10 children tested as recently as last week were positive for the virus, the company said. By comparison, nearly 80 percent of children in this age group tested positive in late October.
    "Our data are a welcome indication that H1N1 may not be the health threat during the holidays that it has been throughout the fall," said Jay M. Lieberman, the company’s medical director for infectious diseases.
    "Nonetheless, this is no time for people to be complacent about protecting themselves and their families from HIN1 infection," he said. " The 2009 HIN1 influenza virus continues to be far and away the most significant source of influenza in every region of the US, according to our data. Many millions of people remain susceptible to the virus, which continues to cause serious disease in some individuals. In addition, the prospect of a third wave of virus activity next year means it is far too soon to declare victory over H1N1." The company’s findings mirror reports from the federal Centers for Disease Control and Prevention, which has found a significant drop in flu cases around the country.
    Federal health officials, however, are urging people to continue to get vaccinated against the disease. After an initial shortage of vaccine that prompted health officials to limit the vaccine to children, pregnant women and other people at high risk from the virus, most states are now making the vaccine available to anyone who wants it.
What can we infer from the first paragraph?
选项 A、The second wave of H1N1 infection is at its peak.
B、Swine flu has ceased to exist in the U.S.
C、The influence of H1N1 has declined.
D、The number of people get infected with H1N1 is increasing.
答案A
解析 事实细节题。根据题于提示定位到第一段。该段的意思是．根据一家医疗测试公司的公布，美国被检测出猪流感病毒的人数已大幅下降，证实了甲流病毒在美国的第二波感染已达到顶峰。所以[A]符合题干要求，为正确选项。猪流感在美国不复存在，与原文意思不符，故排除[B]；[C]“猪流感的影响已经衰落”，根据第一段还不能作出这样的结论，故排除；[D]“感染猪流感的人数在增加”，与原文意思不符，故排除。
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