The new epidemic of drug resistant HIV-1
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1 The new epidemic of drug resistant HIV-1 Gillian Hunt Centre for HIV and STI National Institute for Communicable Diseases ICREID March 2018
2 Status of the global HIV epidemic (2016) WHO Global Summary on HIV Epidemic, July 2017
3 People living with HIV by WHO region (2016) WHO Global Summary on HIV Epidemic, July 2017
4 Anti-retroviral targets in the HIV life cycle Siliciano JD and Siliciano RF, Curr Opinions in Virology 2013
5 Antiretroviral options Cihlar and Fordyce, Curr Op Virology 2016
6 WHO recommended ART for adults and adolescents: NNRTI-based (1 st -line) regimens NNRTI NRTI NRTI 1 pill QD Test & Treat No resistance testing performed at ART start irrespective of prior exposure. Viral Load monitoring at least annually If VL>1000cpm, intensified adherence counselling and repeat VL If VL >1000cpm, then switch to 2 nd line. No resistance testing performed at 1L failure
7 PI-based (2 nd line) regimens for adults and adolescents NNRTI NRTI NRTI >3 pills BID PI NRTI NRTI Ritonavir-boosted lopinavir (LPV/r) OR Atazanavir (ATZ) + Rotinavir Zidovudine (AZT) OR Zidovudine (AZT) + Tenofovir DF Viral Load monitoring annually If VL >1000cpm after 12mo Rx, then access 3 rd line where available Resistance testing is recommended at PI regimen failure
8 Global rates of ART coverage UNAIDS/WHO estimates 2017
9
10 HIV testing and care continuum (2016) UNAIDS/WHO estimates
11
12 How HIV drug resistance arises Mutation rate of HIV: ~3 x 10-5 nucleotides/replication cycle virions generated during rounds of replication/day Richmann DD et al, Sci Am 1998; B Larder AIDS 2001
13 Identification of HIV drug resistance mutations Wensing et al Topics in Antiviral Med. 2017
14
15 HIV drug resistance Drug resistant variants are selected during treatment failure Drug resistance variants similarly cause treatment failure May compromise virion fitness Cross resistance within drug classes Different genetic barriers to drug resistance between drug classes Drug resistance mutations can fade in the absence of drug pressure
16 Epidemiology of HIV drug resistance Infection with drug resistant HIV occurs by one of three major mechanisms: Acquired resistance following non-suppressive treatment (secondary resistance) Transmitted resistance (primary resistance) Pre-treatment resistance - levels of HIVDR in ARV drug-naive people initiating ART or people with prior ARV drug exposure(s) initiating or reinitiating first-line ART.
17 Global epidemiology of acquired HIVDR
18 Patterns of HIVDR at NNRTI regimen failure M184V NNRTI Time on treatment K65R / TAMS Pillay, ARHR 2008: n= GP Marconi, CID 2008: n= KZN Hoffmann, CID 2009: n= GP Orrell, AT 2009: n= WC Wallis, JAIDS 2010: n= GP Murphy, AIDS 2010: n= KZN El Khatib, AIDS 2010: n= GP Singh, JAIDS 2011: n=45 <2010 KZN Sunpath, AIDS 2012: n= KZN Sigaloff, ARHR 2012: n= GP Manasa, POne 2013: n KZN Orrell C et al, AVT 2006
19 Changing patterns within N/NNRTI drug class Skhosana L et al, PLoS ONE 2015
20 Increase in resistance with time on failing regimen Mulu et al PloS ONE 2017
21 Increasing levels of PI resistance in sub-saharan Africa Stockdale A et al CID, 2017 From: Effectiveness of Protease Inhibitor/Nucleos(t)ide Reverse Transcriptase Inhibitor Based Second-line Antiretroviral Therapy for the Treatment of Human Immunodeficiency Virus Type 1 Infection in Sub-Saharan Africa: A Systematic Review and Meta-analysis Clin Infect Dis. Published online December 20, doi: /cid/cix1108 Clin Infect Dis The Author(s) Published by Oxford University Press for the Infectious Diseases Society of America.This is an Open Access article distributed under the terms of the Creative Commons Attribution License ( which permits unrestricted reuse, distribution, and reproduction in any medium, provided the original work is properly cited.
22 Decreasing levels of Acquired HIVDR in UK
23 Global epidemiology of transmitted resistance
24 Relationship between ART coverage and TDR WHO HIVDR report 2012
25 Trends in transmitted resistance in sub-saharan Africa Rhee SY PLoS ONE 2015, Manasa J ARHR 2016
26 Transmitted resistance in HIC Kassaye SG CID 2016, Olsen A AIDS 2018, WHO report 2012
27 Effect of Transmitted Resistance on virologic response Wittkop L LID 2011
28 Global epidemiology of pre-treatment resistance
29 Increasing levels of pre-treatment resistance WHO Global HIVDR Report 2017, Gupta R et al LID 2017
30 Levels of resistance detected amongst patients enrolled according to prior ART exposure 100% 80% 60% 40% 63,5% 84,9% No Resistance NNRTI R Dual-class resistance 20% 31,7% 0% 12,1% 4,8% 2,9% Prior ART (n=126) No / Unknown Prior ART (n=996) HIVDR: 37% in ART starters with prior exposure to ARVs 15% in ARV-naive
31 Predicted consequences of PDR PASER: 2579 participants, 5.5% had pretreatment drug resistance. PDR was associated with increased risk of regimen switch (ahr 3.80 p=0.005) PDR was not associated with mortality (ahr 0.75 p=0.617) or new AIDS events (ahr 1.06 p=0.807) VL monitoring can improve the accuracy of failure detection and efficiency of switching practices Boender TS et al, CID,2015
32 Pre-treatment resistance in children Boender et al, Jordan et al CID 2017
33 Modelling the impact of increasing level of HIVDR WHO HIVDR report 2017, Phillips A JID 2017
34 Global action plan and response
35 WHO Global Action Plan on HIV Drug Resistance Prevention and response Adherence Appropriate prescribing and no stock-out Maximise RIC Monitoring and surveillance Expand VL testing Periodic surveys Routine data Research and innovation Service delivery interventions Maximum PH benefit Laboratory capacity Governance and enabling mechanisms Country ownership Sustainable funding
36 Conclusions Rates of pre-treatment resistance are increasing significantly in many LMIC regions Predicted to compromise international efforts to achieve 90% virological suppression targets Efforts to improve retention in care and maintain VS are essential VL testing scale up New formulations should be considered DR can be minimised and prevented
37 Acknowledgements National Institute for Communicable Diseases Centre for HIV and STIs NICD Germs staff National HIV Drug Resistance Working Group and Steering Group National Health Laboratory Service WHO ResNet Centers for Disease Control 37
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