Human T-lymphotropic virus type-1 (HTLV-1) infection was diagnosed in a Thai patient with chronic progressive myelopathy. The phylogenetic tree of the ltr sequencing of HTLV-1 indicated that the virus belongs to the transcontinental genotype of the cosmopolitan subtype A. This is the first case report of HTLV-1-associated myelopathy in Southeast Asia. Awareness of HTLV-1 and related condition should be encouraged in this region and routine screening should be applied to blood donors.
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