Extensive Latent Retroviral Infection in Bone Marrow of Patients With HTLV-I–Associated Neurologic Disease

To the Editor: Human T-lymphotropic virus type I (HTLV-I) is associated with a number of human diseases, most notably adult T-cell leukemia (ATL) and a chronic progressive neurologic disease that resembles multiple sclerosis (MS) termed HTLV-I–associated myelopathy/tropical spastic paraparesis (