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NANB donor_assumption Q

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NANB donor_assumption Q

by vaivish » Wed Jan 06, 2010 11:39 am
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.
19. 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.

OA is a.

Pl help
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by mehravikas » Wed Jan 06, 2010 9:41 pm
IMO - A and E are close contenders. I would go with A here.

The argument mentions that appx 10 percent of donors who are infected with NANB hepatitis will donate the blood because the screening tests will miss 2/3rds of the donors carrying the disease.

What if the donors carrying the disease develop or carry other infections for which screening tests are reliable. Therefore, they could be stopped from donating blood. But the argument assumes that donors who have NANB will not carry any other disease and will be allowed to donate blood.
vaivish wrote: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.
19. 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.

(E) The donors who will still supply NANB-contaminated blood will donate blood at the average frequency for all donors.

OA is a.

Pl help
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