Data on HIV V3 loop region gene env, isolated from patients from different regions of the Republic of Belarus characteristics are presented. It was shown that of the 126 sequences of HIV isolates 96 (76.2%) were classified as R5-tropic, and 30 (23.8%) to the X4-tropic virus variants. It determined that among R5-tropic variants 80 (83.3%) belonged to the A1 subtype, 5 (5.2%) – to B, 4 (4.2%) – to G, 3 (3,%) – to CRF02_AG and CRF03_AB, 1 (1.0%) – to CRF06_cpx, and among X4-tropic 25 (83.3%) – to A1 subtype, 3 (10%) – to CRF03_AB and 1 (3.3%) – to subtype B and unique to recombinant form (URF). It was determined that all of the 25 analyzed amino acid sequences of R5-tropic HIV variants treated to NSI, M-tropic and of 13 X4-tropic, 6 (46.2%) were assigned as SI T-tropic isolates. Determination HIV isolates tropism is not only important in the appointment of fusion inhibitors, but also prognostic.
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