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Definition of Human T-lymphotropic virus type I
Medically reviewed by Min Clinic Staff | Updated: January 2026
Human T-lymphotropic virus type I: (HTLV-I) A virus often referred to simply as the human T-lymphotropic virus (HTLV).
HTLV-II stands for human T-lymphotropic virus type II, which is closely related to HTLV-I.
HTLV-III is now known as the human immunodeficiency virus or HIV.