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Blood banks will shortly start to screen all donors for NANB

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Blood banks will shortly start to screen all donors for NANB [#permalink] New post 01 May 2006, 18:49
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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 choice
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 [#permalink] New post 01 May 2006, 18:54
It should be B.

If the donors carrying NANB virus do not develop the disease themselves then it is difficult to screen them for that particular virus.
And hence the claim that "....blood donors, they will still miss two-thirds of donors carrying NANB hepatitis. "
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ee [#permalink] New post 02 May 2006, 01:44
i will go fo E
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 [#permalink] New post 02 May 2006, 02:32
everything except E is out of scope
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 [#permalink] New post 02 May 2006, 02:47
A, on second thought

Since 10% left, and this is exactly two-thirds , no one of them was screened out by other tests.
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 [#permalink] New post 02 May 2006, 05:57
Very confusing. I would choose E.
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 [#permalink] New post 02 May 2006, 08:20
deowl wrote:
A, on second thought

Since 10% left, and this is exactly two-thirds , no one of them was screened out by other tests.


Can you explain reason behind it?
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 [#permalink] New post 02 May 2006, 08:31
Ok, I seem to be missing something here. I think it is C!
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 [#permalink] New post 02 May 2006, 09:05
gmat_crack wrote:
deowl wrote:
A, on second thought

Since 10% left, and this is exactly two-thirds , no one of them was screened out by other tests.


Can you explain reason behind it?


The author estimates that 10%, which is exactly two-thirds of the the initial persentage, of infected donors will still supply their blood after
the screening tests. So he most probably assumes that no other tests
will disqualify those who passed the NANB test.
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 [#permalink] New post 02 May 2006, 09:11
What is the OA?
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 [#permalink] New post 02 May 2006, 09:41
"A" by negation.

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

Negation: Donors carrying NANB hepatitis, in a large percentage of cases, carry other infections for which reliable screening tests are routinely performed. ==> It means the donors carrying NANB hepatitis, will be disqualified by other "reliable" tests & successs rate will be very high.
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 [#permalink] New post 02 May 2006, 10:10
Plz show me the OA
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 [#permalink] New post 02 May 2006, 10:24
deowl wrote:
gmat_crack wrote:
deowl wrote:
A, on second thought.
Since 10% left, and this is exactly two-thirds , no one of them was screened out by other tests.

Can you explain reason behind it?

The author estimates that 10%, which is exactly two-thirds of the the initial persentage, of infected donors will still supply their blood after
the screening tests. So he most probably assumes that no other tests
will disqualify those who passed the NANB test.


yes, agree with A.

if A is assumed then those disqualified weren't screened out by any other reason other than NANB hepatitis. i mean the reason behind the disqualifications is due to NANB hepatitis.

really tough........
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 [#permalink] New post 02 May 2006, 11:05
Guys its great.

OA is A
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 [#permalink] New post 02 May 2006, 18:27
Good one.
Now I understand after vivek's explaination why it should be A.
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 [#permalink] New post 02 May 2006, 21:08
Agree with A
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Don't be afraid to take a flying leap of faith.. If you risk nothing, than you gain nothing...

  [#permalink] 02 May 2006, 21:08
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