Low HIV testing uptake following diagnosis of a sexually transmitted infection in Spain: implications for the implementation of efficient strategies to reduce the undiagnosed HIV epidemic.

Sexually transmitted infections (STIs) are recognized as one of the conditions in which HIV testing is most clearly indicated. We analyse whether people diagnosed with an STI are being tested for HIV according to the experience of participants in an outreach rapid testing programme in Spain. Between 2008 and 2010, 6293 individuals underwent rapid testing and completed a self-administered questionnaire. We calculated the percentage of individuals that were diagnosed with an STI in the last 5 years and identified the setting where the last episode occurred. We then determined the percentage not receiving an HIV test after the last STI diagnosis and estimated the associated factors. Overall, 17.3% (N = 959) of participants reported an STI diagnosis in the last 5 years, of which 81.5% occurred in general medical settings. Sixty-one percent reported not undergoing HIV testing after their last STI diagnosis, 2.2% of whom reported they had refused the test. Not receiving an HIV test after the last STI diagnosis was independently associated with not being a man who has sex with men (MSM), having had fewer sexual partners, being diagnosed in general medical settings and having received a diagnosis other than syphilis. An unacceptably large percentage of people diagnosed with STI are not being tested for HIV because healthcare providers frequently fail to offer the test. Offering routine HIV testing at general medical settings, regardless of the type of STI diagnosed and population group, should be a high priority and is probably a more efficient strategy than universal screening in general healthcare settings.