Genotypic and pharmacoresistant HIV characteristics in patients in the Socialist Republic of Vietnam

To evaluate the molecular-epidemiological structure and pharmacoresistant HIV variants in HIV-infected individuals in Ho Chi Minh City (Socialist Republic of Vietnam), nucleotide sequences of the polymerase gene fragment (pol) HIV were analyzed in 42 patients (4 people with newly diagnosed HIV infection and 38 with virologic failure of antiretroviral therapy).

Results. In the examined group, HIV circulating recombinant form CRF01_AE (92,2%) prevailed compared to genotype B (5,3%), CRF08_BC was detected in one patient (2,6%). Among people with newly diagnosed HIV infection, 75% were genotype CRF01_AE and 25% were genotype B. The drug resistance mutations to any drugs in 76,2% of patients were detected. Among isolates with identified pharmacoresistance, 43.75% had single mutations. Mutations to IR were more common (84,8%) than mutations to PI (15,2%). The most common mutations were NNRTIs — 47,8%, followed by NRTIs (37%) and PI (15,2%). Isolates with pharmacoresistance only to NRTIs amounted to 9,4% (7,1% of the general group), only to NNRTIs 28,1% (21,4% of the general group), only to PI 12,5% (9,5% from the general group), simultaneously to PI and NRTI 6,25% (4,8% of the general group), to PI and NNRTI 3,1% (2,4% of the general group), to NRTI and NNRTI 37,5% (28,6% of the general group), isolates with drugs resistance mutations to all three groups simultaneously were not detected. The drug resistance mutations occurrence and the occurring number naturally polymorphic variants in patients with two / three ARV regimens were significantly higher than those in patients with one regimen, regardless of the treatment duration. A pharmacoresistance mutation was detected in an ART-naive patient. Based on the foregoing, it seems necessary to monitor the HIV drug resistance in Vietnam to both those receiving ART and those who are ART-naive. K

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