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Aim: The aim of this study was to determine the prevalence in the Turin area of the pathogens most implicated in pelvic inflammatory disease (PID), with particular regard to which risk factors the population taken into consideration is exposed to., Methods: From January 1st 1997 to December 31(st) 2001, 13809 women, aged between 14-54, all subjects being fertile and sexually active, were examined for the first time at St. Anna Hospital in Turin for the diagnosis of sexually transmitted diseases (STDs). A total of 5559 unselected patients were divided into 2 groups according to the presence (1721) or absence (3838) of subjective symptoms related to PID. Both groups underwent a cervico-vaginal bacteriological test for common pathogens, Candida spp., T. vaginalis, bacterial vaginosis, C. trachomatis, Mycoplasma spp., N. gonorrhoeae. The prevalence of each micro-organism was coupled with the anamnestic data collected from a pre-determined questionnaire submitted to all patients. The questionnaire collected personal data: age at the time of first sexual intercourse; the number of partners in the last 6 months; the type of contraceptives used. Statistical analysis was performed using a chi squared test., Results: In our analysis 2 factors proved to be decisive for a correct PID diagnosis: a subjective symptomatology and an anamnesis mainly focused on risk factor evaluation. This result is in accordance with what has been emphasized many times in the literature, i.e. many of these infections have only a few or no symptoms at all., Conclusion: Greater attention to the anamnestic data collection would therefore be the key to focusing the clinical investigations on those who are at a major risk to contracting STDs.