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O01.5 Origin and predictors of early repeat infections among hiv negative women with trichomonas vaginalis receiving a 2 g dose of metronidazole
  1. Patricia Kissinger1,
  2. Christina Muzny2,
  3. Leandro Mena3,
  4. Rebecca Lillis4,
  5. Jane Schwebke2,
  6. Laura Beauchamps3,
  7. Stephanie N Taylor4,
  8. Norine Schmidt1,
  9. Lauren Ostrenga1,
  10. W Evan Secor5,
  11. David H Martin1
  1. 1Tulane University School of Public Health And Tropical Medicine, Department of Epidemiology, New Orleans, USA
  2. 2University of Alabama At Birmingham, Division of Infectious Diseases, Birmingham, USA
  3. 3Univeristy of Mississippi Medical Centre, Department of Medicine, Jackson, USA
  4. 4Louisiana State University Health Sciences Centre, Section of Infectious Diseases, New Orleans, USA
  5. 5Centres for Disease Control and Prevention, Division of Parasitic Diseases And Malaria, Atlanta, USA


Introduction A recent meta-analysis demonstrated superiority of multi-dose metronidazole (MTZ) over the CDC and WHO recommended 2 g dose for the treatment of T. vaginalis (TV). Another study among HIV+ women with TV found higher test-of-cure (TOC)+ rates among women who had asymptomatic bacterial vaginosis (BV) than those without BV. The purpose of this study was to measure the TOC TV+ rate and to examine if the presence of BV influenced that rate.

Methods HIV-/TV+ women treated with 2 g oral directly observed MTZ and who completed their TOC visit 3–12 weeks post treatment were included. Women were tested for TV using NAAT and surveyed via computer at baseline and TOC. Nugent scores≥7, calculated from vaginal gram stain, were considered BV+. MTZ susceptibility testing was performed on TOC TV+ specimens.

Results Of 227 TV+ women included baseline the mean age was 31.3 (S.D. 9.9), 95.2% were African American, 39.3% had multiple male partners in the prior 3 months, 32.3% regularly smoked, 19.4% were binge drinkers, 48.9% had BV and 5.4% had yeast on the gram stain. At TOC, 19.8% were NAAT TV+. Of the 45 TOC-TV+ women, 44 provided sexual exposure information and 10/44 (24.4%) reported sexual re-exposure to baseline partner or sexual exposure to a new partner. Two of 26 (7.7%) TOC+ specimens that underwent susceptibility testing had low to moderate MTZ resistance (50–100 ug/ml). There were no differences in TOC NAAT+ rates by BV, sexual re-exposure to a baseline partner, sexual exposure to a new partner, regular smoking, binge drinking, or by the presence of yeast (p>0.22).

Conclusion TOC NAAT+ rate after 2 g MTZ dose was high (19.8%) and isolates from these women were susceptible to MTZ (94.3%). Most TOC+ women (75.6%) reported no sexual exposure/re-exposure during follow-up suggesting that most cases were treatment failures. Selected behavioural factors and BV did not did not appear to influence TV treatment. The 2 g MTZ dose for TV recommended by CDC and WHO, should be reevaluated in light of more sensitive NAAT.

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