Introduction: Of 37.7 million people living with HIV in 2020, 6.1 million still do not know their HIV status. We synthesise evidence on concurrent HIV testing among people who tested for other sexually transmitted infections (STI). Methods: We conducted a systematic review using five databases, HIV conferences and clinical trial registries. We included publications between 2010 and May 2021 that reported primary data on concurrent HIV/STI testing. We conducted a random-effects meta-analysis and meta-regression of the pooled proportion for concurrent HIV/STI testing. Results and discussion: We identified 96 eligible studies: the majority (73%) were from high-income countries (HIC), with a third from general populations (36%) and non-heterosexual populations (30%). Among the 96 studies, 18 studies had relevant data for a meta-analysis for the proportion of people tested for HIV among those attending a clinic with STI testing services, 15 studies among those tested for other STIs, 13 studies among those diagnosed with STI and three studies for people with STI symptoms. The remaining studies provided data on the acceptability, feasibility, barriers, facilitators, economic evaluation and social harms of concurrent HIV/STI testing. The pooled proportion of people tested for HIV among those attending an STI service (n=18 studies) was 71.0% [95% confidence intervals: 61.0-80.1, I2=99.9%], people tested for HIV among those who were tested for STIs (n=15) was 61.3% [53.9-68.4, I2=99.9%], people tested for HIV among those who were diagnosed with an STI (n=13) was 35.3% [27.1-43.9, I2=99.9%]. and people tested for HIV among those presenting with STI symptoms (n=3) was 27.1% [20.5-34.3, I2=92.0%]. The meta-regression analysis found that heterogeneity was driven mainly by identity as a sexual minority, the latest year of study, country-income level and region of the world. Conclusions: Not testing for HIV amongst people using STI services presents a significant missed opportunity, particularly among those diagnosed with an STI. Stronger integration of HIV and STI services is urgently needed to improve prevention, early diagnosis, and linkage to care services. PROSPERO Number: CRD42021231321

Background Despite the increase in the proportion of HIV notifications attributed to heterosexuals in Australia, little is known about their HIV testing behaviours. We investigated the trends and factors associated with HIV testing behaviours among heterosexuals. Methods We analysed the trend and proportion of heterosexuals attending the centre for the first time between 2011 and 2020, who had ever tested and tested for HIV in the past 12 months and the median number of months since their last HIV test. We identified factors associated with HIV testing behaviours using univariable and multivariable logistic regressions. Results Of the 78 652 heterosexuals included, 53.1% were men and 46.9% were women. Overall, the proportion of heterosexuals who had ever tested for HIV was 40.8%, with a declining testing trend from 40.2% in 2011 to 36.5% in 2020 (Ptrend < 0.001). Overall, the proportion of heterosexuals tested for HIV in the past 12 months was 15.7%, with no significant change from 15.3% in 2011 to 14.7% in 2020 (Ptrend = 0.489). The median number of months since the last HIV test decreased from 18.0 (IQR 6.9–37.3) in 2011 to 15.0 (IQR 6.4–32.5) in 2020 (Ptrend < 0.001). Individuals who had condomless sex with casual partners (aOR 0.92, 95% CI 0.88–0.96) and who were diagnosed with a sexually transmitted infection (aOR 0.88, 95% CI 0.84–0.93) were less likely to have ever tested for HIV. Conclusions HIV testing was low among heterosexuals, and individuals who engaged in condomless sex and had another sexually transmitted infection were less likely to be tested. To reduce HIV transmission, strategies to improve HIV testing among heterosexuals are needed.