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Blood banks will shortly start to screen all donors for NANB

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Manager
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Blood banks will shortly start to screen all donors for NANB [#permalink] New post 06 Dec 2004, 19:00
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Blood banks will shortly start to screen all donors for NANB hepatitis. Although the new screening tests are estimated to 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 of actual donors will still supply NANB-contaminated blood.

The argument above depends on which of the following assumptions?
(A) Donors carrying NANB hepatitis do not, in a large percentage of cases, carry other infections for which reliable screening tests are routinely performed.
(B) Donors carrying NANB hepatitis do not, in a large percentage of cases, develop the disease themselves at any point.
(C) The estimate of the number of donors who would be disqualified by tests for NANB hepatitis is an underestimate.
(D) The incidence of NANB hepatitis is lower among the potential blood donors than it is in the population at large.
(E) The donors who will still supply NANB-contaminated blood will donate blood at the average frequency for all donors.

please your answers and explanations
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 [#permalink] New post 06 Dec 2004, 19:32
A it is

Here the Author states "about 10 percent of actual donors will still supply NANB-contaminated blood" based on the assumption that donors carrying NANB-contaminated blood won't be tested for any other conditions that might disqualify from donating blood
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 [#permalink] New post 06 Dec 2004, 19:36
I will go with A on this one. The donors who carry NANB and are missed out is because, they haven't shown any symptoms that was prompting for any screening. So, it is assumed that not every donor is specifically checked for NANB hepatitis.
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 [#permalink] New post 06 Dec 2004, 19:53
thank you guys!

OA is A.
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 [#permalink] New post 06 Dec 2004, 19:54
I will go with E.
Conclusion: There will be 10% people donating blood that is contanimated.
Assumtion: They will stay the same number(10%) when compared to other people.
  [#permalink] 06 Dec 2004, 19:54
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