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Blood banks will shortly start to screen all donors for NANB

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Intern
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Blood banks will shortly start to screen all donors for NANB [#permalink]

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New post 10 Feb 2009, 06:15
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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.

Please explain your answer

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Senior Manager
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Re: CR- screening tests [#permalink]

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New post 10 Feb 2009, 06:34
Only A seems good.

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Senior Manager
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Re: CR- screening tests [#permalink]

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New post 10 Feb 2009, 09:07
I'll go with E

If the frequency of donation of infected persons is more than that of the normal persons then obviously the % mentioned in the conclusion will go up. This attacks the conclusion

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Director
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Re: CR- screening tests [#permalink]

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New post 10 Feb 2009, 10:56
E for me....same reason as unplugged

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Senior Manager
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Re: CR- screening tests [#permalink]

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New post 10 Feb 2009, 18:13
Straight forward E is the best answer.

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Intern
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Re: CR- screening tests [#permalink]

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New post 10 Feb 2009, 22:14
OA is A. can anyone explain this?

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Senior Manager
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Re: CR- screening tests [#permalink]

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New post 11 Feb 2009, 03:40
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If there is screening for other infection and this screening rule out the patients who carry the NANB virus then the percentage can be less than 10%. Hmm, this answer was the only answer which seemed to me an assumption. The answer was not straight forward for me at all.

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Re: CR- screening tests [#permalink]

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New post 11 Feb 2009, 05:47
Yes, now it makes much sense. :)
Thanks zoltan +1

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Re: CR- screening tests   [#permalink] 11 Feb 2009, 05:47
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Blood banks will shortly start to screen all donors for NANB

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