The MOSAIC trial offers three essential lessons for public health practitioners designing interventions for underserved populations. First, community health worker-led onsite testing directly increases uptake among historically excluded groups by eliminating transportation and accessibility barriers. Second, re-entry organizations function as trusted institutional partners—existing community anchors where health services can be integrated into established support networks rather than requiring individuals to navigate fragmented healthcare systems.
Third, and perhaps most important, the community-embedded model demonstrates proven scalability. Success with COVID-19 testing provides a blueprint for expanding to HIV and hepatitis C screening, suggesting that this intervention framework can address multiple infectious disease priorities simultaneously.
For health systems and public health agencies, MOSAIC demonstrates that sustainable equity requires meeting vulnerable populations in trusted community spaces through familiar local partners.
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