Blood banks will shortly start to screen all donors to 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 trick in the passage I can’t be sure is as follows,
Is “all prospective blood donors” = “actual donors” here ?
Or “all prospective blood donors”= “actual donors” plus “the number of donors who would be disqualified by tests for NANB hepatitis”? My understanding is the latter .
Originally it's a CR problem , but I can't make sure the right meaning of the passage itself, i.e., to me it's a RC problem first , So i ask the problem here.
Blood banks will shortly start to screen all donors to 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 the blood at the frequency for all donors.
The trick in the passage I can’t be sure is as follows,
Is “all prospective blood donors” = “actual donors” here ?
Or “all prospective blood donors”= “actual donors” plus “the number of donors who would be disqualified by tests for NANB hepatitis”? My understanding is the latter .
