Use of the Gen-Probe PACE system for the detection of Neisseria gonorrhoeae in urogenital samples

Abstract

The Gen-Probe PACE (Probe Assay-Chemiluminescent Enhanced) system for Neisseria gonorrhoeae was compared to Martin-Lewis medium in JEMBEC plates for the direct detection of N. gonorrhoeae in urogenital samples. This 2-hr, nonisotopic chemiluminescent test is based on the use of an acridinium ester-labeled DNA probe that binds with gonococcal target rRNA in a clinical sample. Following the separation of the hybridized probe from the unhybridized probe through the use of magnetic microparticles, the acridinium ester is hydrolyzed from the hybridized probe by the addition of an alkaline hydrogen peroxide solution, resulting in the production of light, which is measured in a luminometer. The amount of light generated is directly proportional to the amount of gonococcal target rRNA present in the sample. A total of 209 urethral and 203 endocervical specimens were collected from a high-risk, clinic population with a gonococcal disease prevalence of 24% during the study period. Statistical analyses of the overall results showed that, compared to culture, the Gen-Probe PACE System had a sensitivity, specificity, and positive and negative predictive values of 90%, 99%, 98%, and 97%, respectively. The comparative results of this study showed that the Gen-Probe PACE System for N. gonorrhoeae is a reasonable, noncultural alternative for detecting gonococci directly in urogenital specimens.