Question: What causes Human T-cell leukemia virus type 2 ?
Answer: What causes human T-cell leukemia virus, type 2? Human T-cell leukemia virus, type 2 (HTLV-2) occurs when a person is infected by the human T-cell leukemia retrovirus. HTLV-2 is spread by blood transfusions, sexual contact and sharing needles. It can also be spread from mother to child during birth or breast-feeding. It is unclear why some people with HTLV-2 may develop neurological problems and other medical conditions, while others remain asymptomatic (show no signs or symptoms) their entire lives.
Source: GARD