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Mobile populations are at increased risk for HIV infection. Exposure to HIV prevention messages at all phases of the migration process may help decrease im/migrants’ HIV risk. We investigated levels of exposure to HIV prevention messages, factors associated with message exposure, and the association between exposure to prevention messages and HIV testing behavior among Mexican im/migrants at different phases of the migration process. We conducted a cross-sectional, probability survey of Mexican im/migrants (N=3,149) traveling through the border city of Tijuana, Mexico. The results indicate limited exposure to prevention messages (57%–75%) and suboptimal last 12-month HIV testing rates (14%–25%) across five migration phases. Compared to pre-departure levels (75%), exposure to messages decreases at all post-departure migration phases (57%–63%, p

Temporary and unauthorised migrants may face unique obstacles to access healthcare services in the USA. This study estimated levels of healthcare access among Mexican migrants returning to Mexico from the USA and factors associated with access to healthcare, with emphasis on the role of modifiable, enabling factors. We conducted a pilot probability healthcare survey of migrants in the border city of Tijuana, Mexico (N = 186). Approximately 42% of migrants reported having used healthcare services in the USA during the past year. Only 38% had a usual source of care and approximately 11% went without needed medical care in the USA. About 71% of migrants did not have health insurance in the USA. Lack of health insurance and transportation limitations were significantly related to various access indicators. These results have implications for future policies and programmes aimed to address modifiable healthcare access barriers faced by these vulnerable and underserved segments of the Mexican migrant population.