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  • Title: Evaluation of affirm VP Microbial Identification Test for Gardnerella vaginalis and Trichomonas vaginalis.
    Author: Briselden AM, Hillier SL.
    Journal: J Clin Microbiol; 1994 Jan; 32(1):148-52. PubMed ID: 8126171.
    Abstract:
    A commercial system (Affirm VP Microbial Identification Test; MicroProbe Corp.) for detection of vaginal pathogens was evaluated with 176 consecutive women attending a sexually transmitted disease clinic for genital complaints. Vaginal swab specimens were used for culture of Gardnerella vaginalis and Trichomonas vaginalis, preparation of a vaginal smear for Gram stain interpretation, and wet mount evaluation. An additional swab was used to evaluate the 30-min nonisotopic oligonucleotide probe test. The automated probe system detected G. vaginalis in 69 (95%) of 73 women having > 5 x 10(5) CFU of G. vaginalis per ml by culture, and 20 (43%) of 47 specimens with < or = 5 x 10(5) CFU of G. vaginalis per ml. There were three false positives and four false negatives for the Affirm VP test compared with > 5 x 10(5) CFU of G. vaginalis per ml. The probe system detected G. vaginalis in 57 (90%) of 63 vaginal specimens from women having clue cells on wet mount examination, and in only 3 (3%) of 113 women without clue cells, suggesting that the Affirm probe for G. vaginalis could be used as a surrogate for wet mount examination for clue cells. The T. vaginalis probe was positive for 12 of 12 specimens positive by wet mount and 12 of 15 specimens positive by culture. There were no false positives and three false negatives for the Affirm VP test compared with culture and/or wet mount for T. vaginalis. The Affirm VP Microbial Identification System is a rapid, objective, and automated test for the detection of T. vaginalis and clinically significant levels of G. vaginalis that is comparable to wet mount examination for clue cells and is superior to wet mount examination for the detection of trichomonads.
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