HUMAN T-LYMPHOTROPIC VIRUS TYPE-II INFECTION IN VIETNAMESE THALASSEMIC PATIENTS

Anti-human T-lymphotropic virus type I/II (HTLV-I/II) antibodies were screened by particle agglutination test in a total of 66 patients with thalassemia major who received multiple transfusion from paid donors at the Blood Transfusion Hematology Center of Ho Chi Minh City in Sout h Vietnam. HTLV-II infection was confirmed in 6 patients (9.1%) by Wes tern blot analysis and/or polymerase chain reaction. Phylogenetic anal ysis revealed that long terminal repeat sequences of HTLV-II proviruse s from 5 thalassemic patients in Vietnam belonged to the same phylogen etic subgroup of HTLV-IIb as those from intravenous drug abusers in No rth America and Europe. These data shed light on the route of introduc ing HTLV-II into Vietnam.