Figure 2.

Frequency distribution of potentially influential factors associated with false-negative (FN) oral fluid OraQuick (OFOQ) tests. Barplot showing count (y-axis) of OFOQ tests performed among 287 seroconverters, according to the number of contributing factors present (x-axis), from among 8 potentially influential factors associated with OFOQ tests. The proportional contribution of each factor to total bar height (test count) in each test category (false negative [FN], true negative [TN], true positive [TP]) is shown as colored bar segments. Factors shown include time to kit expiration, test operator with excess FN results, clinic site with excess FN results, antiretroviral (ARV) exposure, OFOQ test done before appearance of Western blot gp41 band, OFOQ test done before enzyme immunoassay (EIA) conversion, OFOQ test performed within 90 days of estimated time of infection, plasma viral load (pVL) <30 000 copies/mL. Tests with no factors are shown with gray bars. Data are shown for each OFOQ test performed, and individual study participants generally contributed >1 test. Missing data were assumed to be negative.