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Background: Chemsex is a heterogeneous phenomenon with differences in distribution, setting, motivations and type of substances consumed between countries. The lack of data at national level of the Italian situation creates a perception of reduced need for intervention., Methods: Anonymous paper questionnaires were distributed to patients who had registered themselves at the STI Department IRCCS Ca' Granda Policlinico in Milan., Results: A significant association was demonstrated between use of sexualised drugs, chemsex and the following variables: (1). Number of partners: in the group of clients with more than five partners, sexualised drug users were more than twice compared with those in the group with less than five partners (35.2% vs 16.2%) p <0.0001. (2). Use of dating apps: more than one out of two persons who used drugs during sex affirmed looking for partners on internet, p = 0.0059. (3). Low condom uses with occasional partners: percentage of individuals who declared not to use condoms or devices during their sexual encounters with occasional partners is more than twice as high in the sexualised drug users group with respect to controls (44.6% vs 21.4%); p = 0.0006). (4). Use of post exposure prophylaxis (PEP): among the PEP users, more than half participants belonged to the sexualised drug users' group; p = 0.0021., Conclusions: Sexualised drug use and chemsex are frequently practiced in Milan. This survey identified a specific population with higher-risk sexual behaviours and increased incidence of acute bacterial STIs., Competing Interests: Declaration of conflicting interestsThe author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Background: The HIV pandemic impacts the lives of millions and despite the global coordinated response, innovative actions are still needed to end it. A major challenge is the added burden of coinfections such as viral hepatitis, tuberculosis and various sexually transmitted infections in terms of prevention, treatment and increased morbidity in individuals with HIV infection. A need for combination prevention strategies, tailored to high-risk key populations arises and technology-based interventions can be a valuable asset. The COVID-19 pandemic challenged the delivery of existing services and added stress to existing public health and clinical structures but also highlighted the potential of exploiting technical solutions for interventions regarding infectious diseases. In this paper we report the design process, results and evaluation findings from the pilots of 'RiskRadar'-a web and mobile application aiming to support combination prevention, testing and linkage to care for HIV, viral hepatitis, various sexually transmitted infections and tuberculosis.Methods: RiskRadar was developed for the INTEGRATE Joint Action's aim to improve, adapt and pilot innovative digital tools for combination prevention. RiskRadar was designed iteratively using informed end-user-oriented approaches. Emphasis was placed on the Risk Calculator that enables users to assess their risk of exposure to one or more of the four disease areas, make informed decisions to seek testing or care and adjust their behaviours ultimately aiming to harm/risk reduction. RiskRadar has been piloted in three countries, namely Croatia, Italy and Lithuania.Results: RiskRadar has been used 1347 times across all platforms so far. More than 90% of users have found RiskRadar useful and would use it again, especially the Risk Calculator component. Almost 49.25% are men and 29.85% are in the age group of 25-34. The application has scored 5.2/7 in the User Experience Questionnaire, where it is mainly described as "supportive" and "easy-to-use". The qualitative evaluation of RiskRadar also yielded positive feedback.Conclusions: Pilot results demonstrate above average satisfaction with RiskRadar and high user-reported usability scores, supporting the idea that technical interventions could significantly support combination prevention actions on Sexually Transmitted Infections. [ABSTRACT FROM AUTHOR]