a,c on behalf of the "190" working group Background and aims: Chemsex is a growing concern among men who have sex with men (MSM). COVID-19 lockdowns have had consequences on social and sexual interactions. We aimed to assess changes in chemsex practices during COVID-19 lockdown in France among MSM and factors associated with maintaining or increasing chemsex practice.Methods: Repeated face-to-face questionnaires were conducted at "Le 190" Sexual Health Center, Paris, France, exploring lifestyle, sexual, and chemsex practices, COVID-19 concerns and mental health before and during second lockdown in France (30/10/ 2020-15/12/2020). Inclusion criteria were chemsex practices at least 3 times throughout lifetime and at least once in the 3 months before second lockdown. The primary end point was the proportion of participants who declared having stopped, decreased, maintained, or increased their chemsex practice during lockdown. Univariable and multivariable logistic regressions were used to analyze factors associated with evolutions of chemsex practice.Results: Ninety-three MSM were included: 66% HIV-positive and 30% taking PrEP. Drugs most used were cathinones (91%) and GHB/GBL (52%). Participants reported stopping, decreasing, maintaining, and increasing chemsex drugs use in 14%, 22%, 22%, and 42% of cases, respectively. Despite this overall increase in chemsex practice, MSM decreased their number of sexual partners. Factors significantly associated with maintaining or increasing chemsex drugs use were feeling lonely (OR = 3.24), craving (OR = 4.51), and working during lockdown (OR = 3.27), contrasting with fear of COVID-19 (OR = 0.31). Conclusion:Restriction measures lead to changes in sexual behavior and seem to increase chemsex practice. Maintaining care for most isolated patients should be a priority in COVID-19 context.

ObjectivesHIV self-tests (HSTs) have been deployed to reduce the burden of undiagnosed HIV infections in subpopulations undertested. We assumed that patients attending sexual health centres could themselves distribute HSTs in their close network. This study aimed to assess the proportion and the characteristics of the participants who distributed HSTs, as well as the characteristics of people who received HSTs.MethodsThree HSTs were given to patients attending “Le 190” Sexual Health Center, Paris, France, having consented for the study, between July 2018 and August 2020. Participants had to distribute HSTs within 6 months, preferably to individuals in their close circle who have not been tested for a long time. Then they had to complete a self-questionnaire, exploring HIV status, sexual practices, number of distributed HSTs, profile of persons who received HSTs, and if known, result of used HSTs. Univariable logistic regression was used to determine factors associated with HST distribution.ResultsOverall, 682/1062 (64%) patients accepted to be included in the study, and 283/682 (42%) completed the questionnaire. 97% were men who have sex with men (MSMs), including 86 (30%) HIV-positive individuals and 119 (42%) HIV Pre-Exposure Prophylaxis (PrEP) users. The proportion of participants having distributed 0, 1, 2 or 3 HSTs was 31%, 15%, 27% and 27%, respectively. Participants having distributed at least one HST (n=195, 69%) were more likely to have previously used HSTs themselves (OR=3.90, 95% CI=1.84 to 8.29, p<0.001). On the 901 HSTs in possession of participants who answered the questionnaire, 455 (50%) were distributed. 79% of recipients were MSMs, and 42% of whom had not been tested for more than 1 year. The result was known for 220 HSTs, including 5 positive (2.3%).ConclusionMSMs attending sexual health centres could be good disseminators of HSTs, targeting a population with high level of undiagnosed HIV infections, especially if they have already experimented it.