Researchers at the University of California, San Diego have identified active syphilis in approximately 10% of participants in a study examining infectious disease among unhoused people who use drugs, revealing cases that might otherwise have gone undetected and untreated.
The discovery comes as the team confronts two significant obstacles. The National Institutes of Health has restricted foreign research collaborations, requiring the elimination of a planned research component in Tijuana despite the researchers’ previous findings showing that controlling HIV transmission among drug users in San Diego depends on prevention and treatment across the border. Additionally, a nationwide shortage of intramuscular penicillin—the only treatment that can prevent transmission from pregnant patients to newborns—has forced clinicians to prescribe oral antibiotics as an alternative. For people experiencing homelessness, maintaining compliance with daily medication regimens poses substantial challenges, including the risk of losing medications during police sweeps or due to theft.
The intramuscular penicillin shortage stems from multiple factors, including increased demand driven by a sustained syphilis epidemic, reliance on a single domestic manufacturer, and a 2025 recall that worsened supply constraints. Federal agencies have implemented rationing strategies while exploring solutions such as temporary approval of alternative formulations used in Europe. Researchers pursuing clinical trials to determine whether single-injection treatment protocols could expand available supply have experienced processing delays at the NIH, with some applications pending for extended periods.
For study participants like those encountered during outreach efforts, the availability of diagnosis and treatment often depends on relationships built by researchers who distribute naloxone, provide transportation to clinics, and maintain consistent presence in tent encampments. The elimination of cross-border research operations has cut staff and closed the research office in Tijuana, potentially leaving cases in Mexico undetected while limiting researchers’ understanding of disease transmission patterns in the region. The intersection of federal funding constraints, medication shortages, and the vulnerability of unhoused populations has created substantial barriers to comprehensive infectious disease management.
Article Attribution | Read More at Article Source
Article summary produced by Claude AI