Human T-Cell Lymphotropic Virus Type I (HTLV-I)
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A retrovirus that infects only T lymphocytes (T cells). Human T-cell lymphotropic virus type 1 (HTLV-1) is transmitted through exposure to contaminated blood, through sexual contact, and from a mother who has the virus to her child at birth or through breastfeeding via breast milk. HTLV-1 is prevalent mostly in Japan, Africa, the Caribbean Islands, and South America. HTLV-1 can cause adult T-cell leukemia/lymphoma, a rare and aggressive cancer of the white blood cells.
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