[Personal View] Expanding the neurological spectrum of HTLV-1 beyond HAM/TSP: a contemporary perspective

Human T-lymphotropic virus type 1 (HTLV-1) has long been linked mainly to HTLV-1-associated myelopathy/tropical spastic paraparesis (HAM/TSP). However, four decades of research show that the virus causes a much broader range of neurological conditions. In Latin America and the Caribbean—regions with high prevalence but limited awareness, diagnostic capacity, and treatment—its burden is especially severe. Misdiagnosis or neglect often delays care, leading to increased disability and emotional distress.