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Blood banks will shortly start to screen all donors for NANB

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Director
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Blood banks will shortly start to screen all donors for NANB [#permalink] New post 04 Apr 2006, 07:13
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A
B
C
D
E

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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.


I'm more interested in understanding why you chose your answer.
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 [#permalink] New post 04 Apr 2006, 08:20
Wow, a tough one! The argument is of the following type:

Scope shift & understanding the numbers.

My answer, C.

I'm very uncertain about this answer, and was left to choose between B & C. B seemed to be out of scope. The others:

A – Out of scope. Other infections is not discussed.
D – Out of scope. The argument discusses the issue of the screening test. No comparison made to population at large.
E – how often (=frequency) they supply blood is not part of the argument.

What is OA?
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 [#permalink] New post 04 Apr 2006, 09:25
It should be A. A prevents a situation to reduce the other 10%.
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 [#permalink] New post 04 Apr 2006, 09:35
Of course 'A'.
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 [#permalink] New post 06 Apr 2006, 06:36
Yes the OA is A
The officials are giving figures for the number of people giving donations on the assumption that they will not reject people only having this infection. They are not looking at other infections that can happen, which can lead to more people getting rejected.
  [#permalink] 06 Apr 2006, 06:36
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