新东方一题难解

Blood banks will shortly start to screen all donors  for NANB hepatitis.Although the new screening tests are estimated ti disqualify up to 5 percent of all prospective blood donors,they will still miss two thirds of donors carrying NANB hepatitis.Therefore,about 10 percent ofd actual donors will still supply NANB-contaminated blood.

答案是A)

Donors carrying NANB hepatitis do not,in a large percentage of cases, carry other infections for which reliable screening tests are routinely performed.

不太读的懂这个答案　携带别的病毒对检测结果有什么影响吗？

有啊，

携带别的病毒如果是检测的常规检测项目，那么2/3将有一部分会因为别的病被检出而被拒绝进入血库，所以结论的10％就不对了，应该少于10％

谢谢斑竹!题目没读懂 哈