Human T-lymphotropic virus 2
A virus closely related to HTLV-I, Human T-lymphotropic virus 2 (HTLV-II) shares approximately 70% genomic homology (structural similarity) with HTLV-I.
It is found predominantly in Native Americans, and South American Indian groups. And also in Asian countries. More common in Japan and Korea. It can be passed down from mother to child through breastmilk and genetically as well from either parent.
Clinical significance 
An impact on platelet count has been observed.
In the 1980s, HTLV-2 was identified in a patient with an unidentified T cell lymphoproliferative disease that was described as having characteristics similar to the B cell disorder, hairy cell leukemia. HTLV-2 was identified in a second patient with a T cell lymphoproliferative disease; this patient later developed hairy cell leukemia, but HTLV-2 was not found in the hairy cell clones. The cause of hairy cell leukemia is not known, but it is no longer believed to be related to viral infections.
- Roucoux DF, Murphy EL. Unknown parameter
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- International Retrovirology Association
- Human T-lymphotropic virus 2 at the US National Library of Medicine Medical Subject Headings (MeSH)