HIV in South Asia: Understanding and Responding to a ...€¦ · Mumbai, amplifies HIV infection -...
Transcript of HIV in South Asia: Understanding and Responding to a ...€¦ · Mumbai, amplifies HIV infection -...
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HIV in South Asia:Understanding and Responding to
a Heterogeneous Epidemic
David WilsonThe Global HIV/AIDS Program
World Bank
7 January, 2007
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OVERVIEW(1-1)
The core challenge for policy makers and economists working on AIDS in Asia
How to convince governments to invest in programs to protect vulnerable groups – injecting drug users, sex workers and men having sex with men
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INTRODUCTION(1-1)
HIV reached most places at similar time, but spread very differently
Why so heterogeneous?
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How does HIV infectiousness vary over disease stages and how do acute infection and structure of sexual partnerships influence transmission?
Sexual partnerships serial – one after another – or concurrent – overlapping
HETEROGENEITY OF HIV:CONCURRENT SEXUAL PARTNERSHIPS(1-2)
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HIV TRANSMISSION RISKS
Half of all transmissionWawer et al, 2005
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CONCURRENT PARTNERSHIPS GLOBALLY
Sources: Cassell et al, 2005
0
10
20
30
40
50
60
Singapore SriLanka
Thailand Philippines Kenya Tanzania Zambia CoteD'Ivoire
Lesotho
Female Male
Sources: Halperin et al, 2005
Percentage of 15-49 year olds reporting > 1 regular partner in last year
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Concurrent partnerships less common in AsiaMorris showed that without differences in numbers of partners, HIV transmission 10-fold greater with concurrent partnershipsSouth Asia’s epidemics unlikely to be driven by concurrent sexual networks in general population
HETEROGENEITY OF HIV:CONCURRENT SEXUAL PARTNERSHIPS(2-2)
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HETEROGENEITY OF HIV:MALE CIRCUMCISION(1-1)
Meta-analyses - circumcised men 50-70% less likely to get HIVEcological studies - male circumcision major factor in variations in Africa’s HIV epidemicThee randomized trials in Africa - male circumcision reduced HIV transmission by 50-60%In Asia, circumcision’s primary importance ISN’T as intervention, but as determinant of epidemic potentialIn highly circumcised countries – Pakistan, Bangladesh and Afghanistan in South Asia and Indonesia and Philippines in East Asia (which have nearly billion people) – heterosexual transmission may be limited (currently below 0.1%) – unless other factors ignite it – which they may
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DIVERSITY OF HIV IN ASIA IN 2005
0 1 2 3
Cambodia
Thailand
Burma
India
PNG
Vietnam
China
Fiji
Indonesia
Philippines
Pakistan
Bangladesh
Sources: UNAIDS, 2004
Low male circumcision
High male circumcision
2.6
0
1.51.2
0.910.60
0.300.1
0.10.10
(Even lower outside Papua)
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Concurrent sexual partnerships and limited male circumcision fuel and match that lit Southern Africa’s uniquely explosive epidemics – together, these factors may increase HIV transmission 30-fold – explaining much heterogeneity in HIV epidemic potential
HETEROGENEITY OF HIV:THE LETHAL COCKTAIL(1-1)
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TRANSMISSION DYNAMICS(1-2)
Conventional definition - epidemic concentrated until 1%, then generalized -obscures understanding of HIV transmission patternsNeed revised definition:
Concentrated - transmission largely among vulnerable groups and vulnerable group interventions would reduce overall infectionGeneralized - transmission mainly outside vulnerable groups and would continue despite effective vulnerable group interventions
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HIV INFECTION IN HIGH PREVALENCEINDIAN STATES
Sources: India NACO, 2005, US Bureau of the Census, 2005
2.25 1.5 1.43 1.25 1.25 1.25 1.13
22
4.49 4.49
4044.7
2523.630
0
10
20
30
40
50
APManipur
NagalandMizoram
MaharashtraKanartaka Goa
ANC IDU SW MSM
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TRANSMISSION DYNAMICS(2-2)Asian epidemics driven by vulnerable groupsAsian epidemics further differentiated - ignited by sex or drugsAsian epidemics ignited by sex if:
Men uncircumcisedMany men routinely visit SW (> 10%)SW have many clients (> 20 weekly)
Thus, epidemics in Thailand, Cambodia, perhaps Burma, most of India (except North East) ignited by sexElsewhere in Asia, IDU the spark plug that ignites sexual transmission, SW the engine that maintains itThus, in Pakistan, Bangladesh, Indonesia, Vietnam, China, IDU fires sexual transmissionPhilippines – no spark plug, little transmission?East Asian data shows how IDU can fuel HIV in sex work, fundamentallyamplifying epidemic potentialPakistan, Bangladesh, Afghanistan – lands of opportunity. Effective IDUprograms can dramatically curtail sexual epidemics
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NATIONAL ANTENATAL AND POPULATION HIV ESTIMATES
Sources: NAC/NAP, 2001-2003, ORC/MACRO
0
10
20
30
40
Botsw
ana
Lesotho
South Africa
Zambia
Kenya
Tanzania
Uganda
Rw
anda
Ethiopia
Burkina
Sierra Leone
Cam
eroon
Guinea
Ghana
Senegal
Mali
Cam
bodia
DR
Peru
ANC POPSouthern Africa LACWest AfricaEast Africa Asia
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USING DATA FOR PROGRAMMING:DATA ROBUSTNESS IN INDIA(1-1)
India relies on ANC data - data emerging from other sources
ANC and vulnerable group data considerable but uneven, especially in North
What are we learning globally about the relationship between ANC and population data?
India doing world’s largest ever national population survey in 2006 - until then, the available evidence suggests India’s HIV estimates are credible
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ANC AND POPULATION DATA IN TAMIL NADU
0
0.2
0.4
0.6
0.8
1
1.2
1998 ANC
1999 ANC
2000 ANC
2001 ANC
2002 ANC
2003 ANC
2004 ANC
CHENNAI POP 2003
TN POP 2004
Sources: NACO, 2005, APAC, 2005, Celentano et al, 2004
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HIV IN INDIA(1-6)
Overview
India’s 7 high prevalence states –in South, West and North-East – have many of the detected HIV cases
However, they also have much of the existing surveillance
National population survey will provide vital data
Sources: NACO, 2005
TN
KNAP
MH
GA
MZMN
NL
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HIV IN INDIA(2-6)
Overview
HIV in South, West and North-East apparently five-fold higher than rest of India (with earlier surveillance caveats)
Sources: Kumar et al, 2005
0
0.5
1
1.5
2
2.5
3
1998 1999 2000 2001 2002 2003
NORTH-EAST SOUTH,WEST REST
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HIV IN INDIA(3-6)
010203040506070
1 2 3+
TN-AP-KN-MH NORTH-EAST REST
Overview
Two to four-fold more sexual partners in last year in South and West
Sources: Kumar et al, 2005
010203040506070
1 2 3+
TN-AP-KN-MH NORTH-EAST REST
MALES FEMALES
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HIV IN INDIA(4-6)
Overview
NACO’s district analysis important
About 50 high prevalence districts (many rural) –have many of the detected HIV cases
Many high prevalence districts in 3 major clusters:
KN-MH corridorCoastal APNorth-East
However, many districts have not data
Sources: NACO, 2005Sources: NACO, 2005
KN-MHCoastal AP
NE
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HIV IN INDIA (5-6)
Recent evidence suggests HIV prevalence has fallen among young ANC and STI clients in South India –and remained low and stable in North India
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HIV PREVALENCE IN INDIANANC CLIENTS AGED 15-24
1.7 1.6 1.51.2 1.1
0.2 0.2 0.3 0.3 0.30
0.5
1
1.5
2
2000 2001 2002 2003 2004
South NorthSources: Kumar et al, 2006
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HIV PREVALENCE IN ANC CLIENTSAGED 15-24 BY STATE
Sources: Kumar et al, 2006
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HIV IN INDIA(6-6)
SummaryIndia’s epidemic containableIgnited by IDU in North-West and SW elsewhereRequires highly disaggregated analysis and response – focusing on high prevalence districts and blocksLikely to be determined in 30-50 key districts in 7 key statesSignificant rural epidemic in Karnataka
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USING DATA FOR PROGRAMMING:NEPAL(1-3)
0102030405060
1991 1992 1992 1994-7 1998 1999
IDU SWSources: NACO, 2005
In Kathmandu, IDU rates rose rapidly, amplifying SW infection
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USING DATA FOR PROGRAMMING:NEPAL(2-3)
Sources: NCASC, FHI, 2003
Migration and trafficking, especially to Mumbai, amplifies HIV infection - 40% of Nepal’s epidemic linked to migration and trafficking to India
01020304050607080
SW INDIAMIGRATION
MUMBAIMIGRATION
16%
40%
71%HIV INFECTION AMONG SW
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USING DATA FOR PROGRAMMING:NEPAL(3-3)
Summary
Nepal’s epidemic comparable to India’s and more severe than recognized
Driven by IDU and SW and migrants, particularly SW migrating to Mumbai
Instability hinders response -innovative partnerships vital
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USING DATA FOR PROGRAMMING:PAKISTAN(1-2)
0
5
10
15
20
25
30
FSW HIJRA MSW IDU
Karachi Lahore Rawalpindi Sources: NACP, 2004,20055
Epidemic largely in Karachi - mainly IDU, also MSM. FSW rates close to zero
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USING DATA FOR PROGRAMMING:PAKISTAN(2-2)
SummaryMolecular epidemiology shows HIV strains in Karachi new – rising fastPakistan today – lessons from Indonesia a decade agoWithout immediate large-scale, IDU and SW programs, HIV injected into previously resilient, low-prevalence female and male SW networks, fundamentally transforming epidemic character and potential
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USING DATA FOR PROGRAMMING:AFGHANISTAN(1-1)
Between Iran, Central Asia and Pakistan –IDU rates rising
4%
<2000 2005
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USING DATA FOR PROGRAMMING:BANGLADESH(1-5)
Sources: NACP, 2004,20055
HIV rising among IDU, especially in Central region
4.9
0.6
21.7
44
1.4
000
1
2
3
4
5
6
Round II Round III Round IV Round V Round VI
Central SE D NW F1
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USING DATA FOR PROGRAMMING:BANGLADESH(2-5)
Central A2 drug centres % HIV+Area 4 2%Area 5 8.9%Area 6 0%Area 7 0%Area 8 0%Area 9 0%Area 10 0%Area 11 0%Area 12 0%Area 13 0%Area 14 0%
Sources: NASP, 2004,20055
Remarkable concentration – and heterogeneity
1.4
4
8.9
0
2
4
6
8
10
Round IV Round V Round VI
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USING DATA FOR PROGRAMMING:BANGLADESH(3-5)
Sources: NASP, 2004,2005
Rates among other groups almost zero
0.2 00.4
00.6 0.4
0.010
1
2
3
4
5
SW HIJRA MSM
Central SE NE NW
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USING DATA FOR PROGRAMMING:BANGLADESH(4-5)
Sources: NASP, 2004,2005
But rates won’t stay zero unless injecting is kept safe
7.1
1.3
4.9
0
0123456789
10
Male IDU Female IDUCentral A1 Central A2 Central A
FEMALE IDU HIV AMONG FEMALE IDU
0
10
20
30
40
50
60
70
% sexworker
% mainincome sex
work
Clients permonth
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USING DATA FOR PROGRAMMING:BANGLADESH (5-5)
Summary
Epidemic highly focused among IDU in defined localities
Ultra-intensive focus on these areas and large-scale national IDU, SW and MSM programs can prevent further transmission
Some programs already slowing HIV transmission?
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USING DATA FOR PROGRAMMING:SRI LANKA(1-1)
Summary
Sri Lanka’s epidemic limited
Priorities:
Keep SW and MSM safe through large-scale, high quality programs
Establish early warning system to detect growth in IDU and build capacity to manage opiate addiction now
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RECOMMENDATIONS:HIV IN SOUTH ASIA CAN BE CONTAINED(1-1)
South Asia’s HIV epidemics can be curbed
Have sufficient knowledge to tackle South Asia’s epidemics - challenge is to sharpen focus and strengthen implementation
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ENCOURAGING TRENDS IN TAMIL NADU AND KOLKOTA
Sources: NACO, 2005, UNAIDS, 2005
1 1 1 1.13 0.88 0.75
42.4 2.4
0
16.3
10.4
16.8
12.6
14.7
9.02
0
2
4
6
8
10
12
14
16
18
1998 1999 2000 2001 2002 2003
ANC MSM STI
0
20
40
60
80
100
1992 1994 1998 2004
Unprotected sex HIV
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RECOMMENDATIONS:TWO-PRONGED APPROACH(1-1)
Need two pronged approach
First, implementing high quality, high coverage programs for major vulnerable groups
Second, reducing stigma and addressing underlying structural determinants of epidemic
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FIREFIGHTING
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RECOMMENDATIONS:HIV IN SOUTH ASIA CAN BE CONTAINED(1-1)
South Asia’s HIV epidemics can be curbed
Have sufficient knowledge to tackle South Asia’s epidemics - challenge is to sharpen focus and strengthen implementation
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ENCOURAGING TRENDS IN TAMIL NADU AND KOLKOTA
Sources: NACO, 2005, UNAIDS, 2005
1 1 1 1.13 0.88 0.75
42.4 2.4
0
16.3
10.4
16.8
12.6
14.7
9.02
0
2
4
6
8
10
12
14
16
18
1998 1999 2000 2001 2002 2003
ANC MSM STI
0
20
40
60
80
100
1992 1994 1998 2004
Unprotected sex HIV
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RECOMMENDATIONS:TWO-PRONGED APPROACH(1-1)
Need two pronged approach
First, implementing high quality, high coverage programs for major vulnerable groups
Second, reducing stigma and addressing underlying structural determinants of epidemic
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FIREFIGHTING
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AND FIREBREAKS
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NOT ONE INFERNO BUT MANY LOCAL FIRES
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RECOMMENDATIONS:FOCUS(1-2)
Vital to understand heterogeneity of HIV and to focus – dissipation of focus major limitation of HIV programs – no wasted programming
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RECOMMENDATIONS:FOCUS(2-2)
Thematic focus equally important
India’s NACO supports more interventions for migrants than SW -yet migrants have lower HIV rates and far fewer partners
Too few MSM interventions
Migrant249
SW209
IDU74
Prison56
Other56
SK26
MSM25
Sources: NACO, 2005
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Sources: NACO, 2006
RECOMMENDATIONS:GREATER FOCUS ON IDU(1-1)
26.724.56
33.8
39.11
16.310.4
16.8 12.6 14.79.02
4 2.4 2.401 1 1 1.13 0.880.75
0
10
20
30
40
50
1998 1999 2000 2001 2002 2003
IDU STI MSM ANC
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Epidemic potential in North-East hugely influenced by effectiveness of IDU programs today
RECOMMENDATIONSGREATER FOCUS ON IDU(2-2)
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MSM third pillar of epidemic and response – considerable MSM activity, increasing HIV rates, especially among hijra and MSW
Yet, too little surveillance, analysis, modeling and programming – only 2% of Indian interventions
RECOMMENDATIONS:GREATER FOCUS ON MSM (1-1)
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RECOMMENDATIONS:PROGRAM QUALITY AND COVERAGE(1-2)
Across South Asia, coverage still low –especially among MSM
Sources: NACP, 2005
<1 5.519
0
20
40
60
80
100
MSM IDU SW
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RECOMMENDATIONSPROGRAM QUALITY AND COVERAGE(2-2)
Combine laser focus on highest prevalence areas and communities with commitment to expand coverage nationwide
High coverage of adequate interventions better than low coverage of perfect interventions – small behavior change on large scale better than large behavior change on small scale
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RECOMMENDATIONSSTRUCTURAL INTERVENTIONS(1-1)
Easier to achieve scale with contextual than individual level interventions - examples include:
Legal/policy interventions - protecting vulnerable groups and undocumented migrants, reducing trafficking, removing risk and stigma from carrying condoms or needles
Regulatory interventions - 100% condom use programs, regulating enterprises to mitigate induced risk
Institutional interventions - institutionalizing safe injecting rooms, detoxification and substitution programs
Market interventions - liberalizing needle or condom sales, subsidized condom, syringe or bleach social marketing programs
Voucher programs - for needles, STI or BBV treatment
Normative interventions – to promote safer sexual and gender norms
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RECOMMENDATIONSRURAL PROGRAMMING(1-1)
Growing evidence of rural epidemics –greater focus on rural programming vital
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CONCLUSION(1-2)
HIV in South Asia eminently preventable – 99.6% of South Asians uninfected
Notwithstanding challenges, South Asia deserves credit for growing commitment and action
With better use of existing knowledge, focus, implementation and coverage, HIV containable
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CONCLUSION(2-2)
The core challenge for policy makers and economists working on AIDS in Asia
How to convince governments to invest in programs to protect vulnerable groups – injecting drug users, sex workers and men having sex with men