Prevalence of Trichomonas vaginalis Infection in Hamadan City, Western Iran

BACKGROUND Infection with Trichomonas vaginalis is one of the most common sexually transmitted diseases (STDs) in humans. The prevalence of infection in Iran has been reported between 2 to 8%, depending on deferent socio-cultural conditions. This study aimed to determine the prevalence of T. vaginalis in women referred to gynecologic clinics in Hamadan city, West of Iran. METHODS This descriptive cross-sectional study was conducted on 750 women who referred to Gynecologic clinics in Hamadan from November 2010 to July 2011. Vaginal samples were obtained from them and examined by wet mount and culture methods for the detection of T. vaginalis. RESULTS Sixteen out of 750 vaginal swab specimens (2.1%) were culture positive for T. vaginalis and 13 of these positive specimens (1.7%) were wet mount positive. Only 12 of 42 patients who were clinically diagnosed as having T. vaginalis infection, confirmed by culture method. Five hundred and fifty of the participants women (73.3%) had at least one of signs and symptoms of trichomoniasis. No statistical correlation was observed between clinical manifestations and parasitological results (p>0.05). CONCLUSION This study showed low prevalence of T. vaginalis infection in the study population. Since clinical signs of trichomonal vaginitis are the same of other STDs, a confirmatory laboratory diagnosis is necessary. Wet smear as well as culture are sensitive for detection of T. vaginalis.