Factors Associated With Willingness to Use Pre-Exposure Prophylaxis in Brazil, Mexico, and Peru: Web-Based Survey Among Men Who Have Sex With Men

Abstract

Journal of Medical Internet Research - International Scientific Journal for Medical Research, Information and Communication on the Internet #Preprint #PeerReviewMe: Warning: This is a unreviewed preprint. Readers are warned that the document has not been peer-reviewed by expert/patient reviewers or an academic editor, may contain misleading claims, and is likely to undergo changes before final publication, if accepted, or may have been rejected/withdrawn. Readers with interest and expertise are encouraged to sign up as peer-reviewer, if the paper is within an open peer-review period. Please cite this preprint only for review purposes or for grant applications and CVs (if you are the author). Background: HIV epidemics disproportionally affect key populations including men who have sex with men (MSM). HIV prevalence among MSM varies from 17% in Brazil and Mexico to 13% in Peru, while it is below 0.5% for the general population. Pre-exposure prophylaxis (PrEP) with daily oral emtricitabine/tenofovir is being implemented in the context of combination HIV prevention. Reports on PrEP awareness, willingness to use, and acceptability among MSM have started to emerge over the last few years. Previously reported factors associated with willingness to use PrEP include: awareness, low cost, higher sexual risk behavior, prior sexually transmitted infection, and unwillingness to use condoms. Objective: This study aims to evaluate the factors associated with willingness to use daily oral PrEP among MSM in three Latin American, middle-income countries (Brazil, Mexico and Peru). Methods: This online cross-sectional survey was advertised in two gay social network apps (Grindr and Hornet) used by MSM to find sex partners and on Facebook during two months in 2018. Inclusion criteria were ≥18 years of age, cisgender men, and HIV-negative by self-report. Eligible individuals answered questions on: demographics, behavior, and PrEP (awareness, willingness to use, barriers and facilitators). Multivariable logistic regression modeling was performed to assess the factors associated with willingness to use daily oral PrEP in each country. Results: From a total sample of 43,687 individuals, 19,457 (45%) MSM were eligible and completed the online survey (Brazil: 58%, Mexico: 31%, Peru: 11%); median age was 28 years (IQR: 24-34), almost half lived in large urban cities and 89% self-defined as homosexual. Most of the participants were recruited on Grindr (69%). Almost 20% had never tested for HIV and condomless receptive anal sex was reported by 46% in the previous 6 months. A total of 13,110 (67%) would be eligible for PrEP (adapted from WHO risk criteria), but only 10% of participants had high HIV risk perception. PrEP awareness was reported by 65%, this was lower in Peru (46%). Overall, willingness to use PrEP was reported by 64%, highest in Mexico (70%) and lowest in Peru (58%). In multivariate regression models adjusted for age, schooling, and income: in each country willingness to use PrEP was positively associated with PrEP awareness and PrEP facilitators (e.g. free PrEP and HIV testing), and negatively associated with behavioral (e.g., concerned by daily pill regimen) and belief barriers (e.g., sex partners may expect condomless anal sex). Conclusions: In this first cross-country online survey in Latin America, willingness to use PrEP was found to be high and directly related to PrEP awareness. Interventions to increase awareness and PrEP knowledge about safety and efficacy are crucial to increase PrEP demand. This study provides important information to support the implementation of PrEP in Brazil, Mexico and Peru.