Abstract: Introduction: Drug use behaviors are closely associated with increased risk for HIV and other STIs among men who have sex with men (MSM) globally. Less is known about the drug use characteristics and their association with HIV/STI risk among MSM in Mexico, who have 13 times higher risk of acquiring HIV than the general population. We characterized distinct classes of drug use behaviors among a nationwide sample of MSM in Mexico and tested their associations with HIV risk behaviors. Methods: We used latent class analysis (LCA) to analyze injection/non-injection drug use data collected by the online Encuesta de Sexo Entre Hombres self-administered survey among 15,875 MSM living in Mexico between May-June 2017. MSM were recruited on general social media sites (e.g. Facebook and Twitter), popular LGBT + focused web pages (e.g. Soy Homosensual and Desastre), and dating apps (e.g. Grindr and Hornet). We used robust Poisson regression to examine associations between drug use classes and recent sexual risk behaviors while adjusting for sociodemographic characteristics. Results: Most participants were under 30 years of age (65.5%), received a Bachelor’s degree or higher (65.2%), gay-identified (82.5%), HIV negative (58.1%), and lived in the Mexico City/State of Mexico region (34.5%). We identified five distinct drug use classes: Limited Drug Use (75.4%), Marijuana Only (15.1%), Sex Event Popper + Marijuana (4.3%), Club Drug + Marijuana (4.2%), and Elevated Polydrug Use (1.0%). Compared to the Limited Drug Use class, participants in all other drug use classes were significantly more likely to engage in condomless anal intercourse (aPR = 1.14–1.39; p < 0.001), sex exchange (aPR = 1.37–4.99; p < 0.001), anonymous sex (aPR = 1.22–2.01; p < 0.001), group sex (aPR = 1.50–3.28; p < 0.001), and report an STI diagnosis in the past 12 months (aPR = 1.24–2.20; p < 0.002). Estimates were largest among the Elevated Polydrug Use class. Conclusions: This study is the first to characterize drug use behaviors and HIV/STI risk among a national sample of MSM in Mexico. Understanding how distinct combinations of drug use behaviors impact sexual risk and prevention behaviors among MSM can inform how best to target and tailor future interventions to reduce HIV/STI incidence.

México alcanzará la cobertura universal en salud en 2012. El seguro nacional de salud denominado Seguro Popular, introducido en 2003, garantiza el acceso a un paquete de servicios de salud integrales con protección financiera a más de 50 millones de mexicanos previamente excluidos de la seguridad social. La cobertura universal en México es sinónimo de protección social en salud. Este informe analiza el camino hacia la cobertura universal en sus tres dimensiones de protección: a) contra riesgos para la salud, b) de los pacientes a través de la garantía de calidad de la atención a la salud y c) contra las consecuencias financieras de la enfermedad y las lesiones. Se presenta una discusión conceptual sobre la transición de una seguridad social basada en la condición laboral a la protección social en salud, que implica el acceso a una atención integral de la salud como derecho universal basado en la ciudadanía, plataforma ética de la reforma mexicana. Se describen asimismo las condiciones que llevaron a la reforma, así como su diseño y puesta en marcha, y se discute el proceso de implantación a nueve años de iniciado y las evidencias que dieron origen a actualizaciones y mejoras del programa original. El núcleo del informe se centra en los efectos e impactos de la reforma que se desprenden de la literatura sobre el tema, que incluye artículos científicos y otras publicaciones disponibles. La evidencia indica que el Seguro Popular está mejorando el acceso a los servicios de salud y reduciendo la prevalencia de los gastos en salud catastróficos y empobrecedores, especialmente entre los pobres. Estudios recientes muestran asimismo una mejora en la cobertura efectiva. También se discuten los desafíos prevalentes, incluyendo la necesidad de traducir los recursos financieros en servicios de salud más efectivos, equitativos y sensibles a las expectativas de los usuarios. Se requiere una nueva generación de reformas que incluya medidas sistémicas para consolidar la reorganización del sistema de salud por funciones. El artículo concluye con una discusión sobre las implicaciones de la búsqueda de la cobertura universal de salud en México y su importancia para otros países de ingresos bajos y medios.

Background

An alternative approach to the traditional model of radiologists interpreting screening mammography is necessary due to the shortage of radiologists to interpret screening mammograms in many countries.

Methods

We evaluated the performance of 15 Mexican radiographers, also known as radiologic technologists, in the interpretation of screening mammography after a 6 months training period in a screening setting. Fifteen radiographers received 6 months standardized training with radiologists in the interpretation of screening mammography using the Breast Imaging Reporting and Data System (BI-RADS) system. A challenging test set of 110 cases developed by the Breast Cancer Surveillance Consortium was used to evaluate their performance. We estimated sensitivity, specificity, false positive rates, likelihood ratio of a positive test (LR+) and the area under the subject-specific Receiver Operating Characteristic (ROC) curve (AUC) for diagnostic accuracy. A mathematical model simulating the consequences in costs and performance of two hypothetical scenarios compared to the status quo in which a radiologist reads all screening mammograms was also performed.

Results

Radiographer's sensitivity was comparable to the sensitivity scores achieved by U.S. radiologists who took the test but their false-positive rate was higher. Median sensitivity was 73.3 % (Interquartile range, IQR: 46.7-86.7 %) and the median false positive rate was 49.5 % (IQR: 34.7-57.9 %). The median LR+ was 1.4 (IQR: 1.3-1.7 %) and the median AUC was 0.6 (IQR: 0.6-0.7). A scenario in which a radiographer reads all mammograms first, and a radiologist reads only those that were difficult for the radiographer, was more cost-effective than a scenario in which either the radiographer or radiologist reads all mammograms.

Conclusions

Given the comparable sensitivity achieved by Mexican radiographers and U.S. radiologists on a test set, screening mammography interpretation by radiographers appears to be a possible adjunct to radiologists in countries with shortages of radiologists. Further studies are required to assess the effectiveness of different training programs in order to obtain acceptable screening accuracy, as well as the best approaches for the use of non-physician readers to interpret screening mammography.

Mexico is reaching universal health coverage in 2012. A national health insurance programme called Seguro Popular, introduced in 2003, is providing access to a package of comprehensive health services with financial protection for more than 50 million Mexicans previously excluded from insurance. Universal coverage in Mexico is synonymous with social protection of health. This report analyses the road to universal coverage along three dimensions of protection: against health risks, for patients through quality assurance of health care, and against the financial consequences of disease and injury. We present a conceptual discussion of the transition from labour-based social security to social protection of health, which implies access to effective health care as a universal right based on citizenship, the ethical basis of the Mexican reform. We discuss the conditions that prompted the reform, as well as its design and inception, and we describe the 9-year, evidence-driven implementation process, including updates and improvements to the original programme. The core of the report concentrates on the effects and impacts of the reform, based on analysis of all published and publically available scientific literature and new data. Evidence indicates that Seguro Popular is improving access to health services and reducing the prevalence of catastrophic and impoverishing health expenditures, especially for the poor. Recent studies also show improvement in effective coverage. This research then addresses persistent challenges, including the need to translate financial resources into more effective, equitable and responsive health services. A next generation of reforms will be required and these include systemic measures to complete the reorganisation of the health system by functions. The paper concludes with a discussion of the implications of the Mexican quest to achieve universal health coverage and its relevance for other low-income and middle-income countries.