Contemporary Clinical Immunology and Serology 1st Edition by Kate Rittenhouse Olson,Ernesto DeNardin

Exercise 7

A van was set up outside of a local bar so that couples would get an EIA for HIV before they went home with each other for the evening. A young entrepreneur had this idea as a way to help couples be sure that their new partner is not HIV infected and as a way to make money; the price tag for his assay was high. Would you buy stock in his company?
A) yes, because the EIA has no false positives or negatives
B) yes, because everyone knows that Western blot is not needed
C) no, because of the window period, this service would not be very useful and the false positives would be a problem
D) no, because the CD4 to CD8 ratio is the only way to know for sure