Access To Viral Load Monitoring Research Articles

Pretreatment HIV-1 drug resistance in Africa

476 www.thelancet.com/infection Vol 13 June 2013 1 Hamers RL, Schuurman R, Sigaloff KCE, et al, for the PharmAccess African Studies to Evaluate Resistance (PASER) Investigators. Eff ect of pretreatment HIV-1 drug resistance on immunological, virological, and drugresistance outcomes of fi rst-line antiretroviral treatment in sub-Saharan Africa: a multicentre cohort study. Lancet Infect Dis 2012;12: 307–17. 2 Lynen L, Fransen K, Van Griensven J, Colebunders R. Pretreatment HIV-1 drug resistance testing in sub-Saharan Africa. Lancet Infect Dis 2012; 12: 911. 3 Roberts T, Bygrave H, Fajardo E, Ford N. Challenges and opportunities for the implementation of virological testing in resource-limited settings. J Int AIDS Soc; 15: 17324. 4 Hamers RL, Sawyer AW, Tuohy M, Stevens WS, Rinke de Wit TF, Hill AM. Cost-eff ectiveness of laboratory monitoring for management of HIV treatment in sub-Saharan Africa: a model-based analysis. AIDS 2012; 26: 1663–72. 5 Sigaloff KC, Hamers RL, Wallis CL, et al. Unnecessary antiretroviral treatment switches and accumulation of HIV resistance mutations; two arguments for viral load monitoring in Africa. J Acquir Immune Defi c Syndr 2011; 58: 23–31. 6 Nichols BE, Sigaloff KC, Kityo C, et al. Benefi ts of early antiretroviral treatment initiation outweigh risk of transmitted HIV drug resistance: a modelling study of two east African settings. 20th Conference on Retroviruses and Opportunistic Infections; March 3–6, 2013; Atlanta, GA. Abstr 1116. 7 Phillips AN, Pillay D, Garnett G, et al. Eff ect on transmission of HIV-1 resistance of timing of implementation of viral load monitoring to determine switches from fi rst to second-line antiretroviral regimens in resource-limited settings. AIDS 2011; 25: 843–50. 8 Gupta RK, Jordan MR, Sultan BJ, et al. Global trends in antiretroviral resistance in treatment-naive individuals with HIV after rollout of antiretroviral treatment in resource-limited settings: a global collaborative study and meta-regression analysis. Lancet 2012, 380: 1250–58. test ing and alternative fi rst-line regimens. Accurate ident ifi cation of virological failure will preserve drug options by avoiding the incremental cost of unnecessary switches and reducing drugresistance accumulation. Moreover, mathematical models predict that access to viral-load monitoring and second-line regimens might mitigate transmitted drug resistance. A shift to protease inhibitors in fi rst-line ART is regarded as a last resort by many experts, since this would have major programmatic implications, increase drug cost, and restrict options for constructing eff ective second-line regimens. Routine pretreatment drug-resistance testing is not feasible for most ART programmes because of restricted resources and laboratory capacity. As levels of transmitted drug resistance increase in east and southern Africa, we argue that improved functioning of national HIV treatment programmes will be crucial to preserve the longterm eff ectiveness of available ART regimens. Functioning would be improved by an uninterrupted drug supply, optimised patient adherence and retention, and access to viral-load monitoring.