HIV-1 drug resistance genotyping quality assessment: Results of the ENVA7 Genotyping Proficiency Programme

A. Pandit, W. G. Mackay, C. Steel, A. M. van Loon, R. Schuurman

Research output: Contribution to journalArticlepeer-review

30 Citations (Scopus)


Background: Drug-resistance testing plays a critical role in selection of optimal treatment regimens for HIV infected individuals. Laboratories performing testing Must implement quality control Measures including external quality assessment.

Objectives: The ENVA7 Programme (2007) was organised by QCMD to assess the performance of laboratories testing for drug-resistance mutations in the HIV-1 Protease and Reverse Transcriptase genes, Study design: The ENVA7 panel consisted of 5 lyophilised plasma samples (HIV-1 subtypes B, C and F). The Viruses harboured wild type OF resistant genotypes at various positions of the PR and RT genes. All IAS-defined resistance-associated codons were scored in comparison to the consensus sequence for each sample using a scoring system developed to allow simple and standardised comparisons between laboratories and/or technologies.

Results: 111 laboratories from 44 Countries participated of which 95 submitted 98 datasets. 36 datasets were generated using Viroseq (Abbott), 27 Using TruGene (Siemens) and 35 U-Sing in-house assays.

Conclusions: All technologies Successfully genotyped each of the panel samples, irrespective of the Virus subtype. While the assays for genotypic HIV drug-resistance determination have evolved into reliable and technically capable procedures of generating high quality results, variation in the quality of results is still observed between laboratories. (c) 2008 Elsevier B.V. All rights reserved.
Original languageEnglish
Pages (from-to)401-406
JournalJournal of Clinical Virology
Issue number4
Publication statusPublished - Dec 2008


  • ENVA7
  • HIV-1 drug resistance
  • External quality assessment


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