HIV in Women: A Global View of the HIV Epidemic
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1 HIV in Women: A Global View of the HIV Epidemic George Schmid, M.D., M.Sc. Department of HIV/AIDS World Health Organization Geneva, Switzerland Schmidg@who.int Training Course in Sexual and Reproductive Health Research
2 The Problem of the HIV Epidemic Why Is it Occurring? What Can We Do About the It?
3 Global estimates for adults and children, 2007 People living with HIV New HIV infections in 2007 Deaths due to AIDS in million [ million] 2.5 million [ million] 2.1 million [ million]
4 p64 GLOBAL ESTIMATES FOR ADULTS AND CHILDREN, 2006 People living with HIV New HIV infections in 2006 Deaths due to AIDS in million [ million] 4.3 million [ million] 2.9 million [ million] The ranges around the estimates in this table define the boundaries within which the actual numbers lie, based on the best available information.
5 Global summary of the AIDS epidemic, December 2007 Number of people living with HIV in 2007 Total Adults Women Children under 15 years 33.2 million [ million] 30.8 million [ million] 15.4 million [ million] 2.5 million [ million] People newly infected with HIV in 2007 Total 2.5 million [ million] Adults 2.1 million [ million] Children under 15 years [ ] AIDS deaths in 2007 Total 2.1 million [ million] Adults 1.7 million [ million] Children under 15 years [ ]
6 Adults and children estimated to be living with HIV, 2007 North America 1.3 million [ million] Caribbean [ ] Latin America 1.6 million [ million] Western & Central Europe [ million] Middle East & North Africa [ ] Sub-Saharan Africa 22.5 million [ million] Eastern Europe & Central Asia 1.6 million [ million] East Asia [ ] South & South-East Asia 4.0 million [ million] Oceania [ ] Total: 33.2 ( ) million
7 Estimated number of adults and children newly infected with HIV, 2007 North America [ ] Caribbean [ ] Latin America [ ] Western & Central Europe [ ] Middle East & North Africa [ ] Sub-Saharan Africa 1.7 million [ million] Eastern Europe & Central Asia [ ] East Asia [ ] South & South-East Asia [ ] Oceania [ ] Total: 2.5 ( ) million
8 Estimated adult and child deaths from AIDS, 2007 North America [ ] Caribbean [ ] Latin America [ ] Western & Central Europe [<15 000] Middle East & North Africa [ ] Sub-Saharan Africa 1.6 million [ million] Eastern Europe & Central Asia [ ] East Asia [ ] South & South-East Asia [ ] Oceania 1200 [< ] Total: 2.1 ( ) million
9 Figure 4, p14 Estimated number of annual new infections and AIDS-related deaths among adults (15+) in relation to the stabilizing trend of estimated prevalence rate among adults (15 49), Lesotho, New infections AIDS deaths HIV prevalence Number of new HIV infections and AIDS-related deaths (thousand) % HIV prevalence Sources: Government of Lesotho/UNAIDS,
10 Over 6800 new HIV infections a day in 2007 More than 96% are in low and middle income countries About 1200 are in children under 15 years of age About 5800 are in adults aged 15 years and older of whom: almost 50% are among women about 40% are among young people (15-24)
11 Figure 1, p4 Percent of adults (15+) living with HIV who are female (%), Percent Female (%) Sub-Saharan Africa Caribbean GLOBAL Latin America Asia Eastern Europe and Central Asia
12 Regional HIV/AIDS statistics and features, end of 2002 Epidemic started Adults & children living with HIV/AIDS Adults & children newly infected with HIV Adult prevalence rate * % of HIVpositive adults who are women Main mode(s) of transmission for those living with HIV/AIDS ** Sub-Saharan Africa North Africa & Middle East late 70s early 80s late 80s 29.4 million million % 0.3% 58% 55% Hetero Hetero, IDU South and South-East Asia late 80s 6.0 million % 36% Hetero, IDU East Asia & Pacific late 80s 1.2 million % 24% IDU, Hetero, MSM Latin America Caribbean Eastern Europe & Central Asia late 70s early 80s late 70s early 80s early 90s 1.5 million million % 2.4% 0.6% 30% 50% 27% MSM, IDU, Hetero Hetero, MSM IDU Western Europe North America Australia & New Zealand TOTAL late 70s early 80s late 70s early 80s late 70s early 80s million million 0.3% 0.6% 0.1% 1.2% 25% 20% 7% 50% MSM, IDU MSM, IDU, Hetero MSM * The proportion of adults (15 to 49 years of age) living with HIV/AIDS in 2002, using 2002 population numbers ** Hetero: heterosexual transmission IDU: transmission through injecting drug use MSM: sexual transmission among men who have sex with men
13 The global view of HIV, end 2001 Recent trends in HIV infection, % of all persons living with HIV/AIDS are in developing countries % + 20% + 20% + 100% + 160% + 40% + 60% HIV prevalence in adults, end % 5 15% 1 5% % % % not available + 30% In 7 countries, >20% of all adults are infected with HIV + 20% Source: UNAIDS/WHO July 2002
14 11.8 million young people (aged 15 24) living with HIV/AIDS 7.3 million young women and 4.5 million young men Latin America & Caribbean 560,000 Industrialized countries 240,000 Central and Eastern Europe, Commonwealth of Independent States and Middle East & North Africa 160,000 Baltic States 430,000 South Asia 1.1 million East Asia & Pacific 740,000 Source: UNICEF/UNAIDS/WHO, Sub-Saharan Africa 8.6 million
15 HIV prevalence (%) HIV prevalence rate among teenagers by age in Kisumu, Kenya Age in years boys girls Source: National AIDS Programme, Kenya, and Population Council, 1999
16 The Impact of HIV/AIDS
17 Changes in life expectancy in African countries with high and low HIV prevalence: Life expectancy (years) with high HIV prevalence: Zimbabwe South Africa Botswana with low HIV prevalence: Madagascar Senegal Mali Source: UN Department of Economic and Social Affairs (2001) World Population Prospects, the 2000 Revision.
18 Leading causes of death in Africa, % of Total HIV/AIDS Malaria Perinatal conditions Tuber culosis Cerebro vascular disease Lower respiratory infections Diarrhoeal disease Measles Ischaemic Heart disease Maternal conditions Source: The World Health Report 2001, WHO
19 Risk of dying of AIDS Lifetime risk of AIDS death for 15-year-old boys, assuming unchanged or halved risk of becoming infected with HIV, selected countries risk halved over next 15 years current level of risk maintained 100% Botswana 80% Zimbabwe South Africa Botswana 60% Zambia 40% Cambodia Côte d Ivoire Kenya Kenya Zimbabwe South Africa Zambia 20% Burkina Faso Cambodia Burkina Faso Côte d Ivoire 0% 0% 5% 10% 15% 20% 25% 30% 35% 40% Current adult HIV prevalence rate Source: Zaba B, 2000 (unpublished data)
20 Why Is the HIV Epidemic Occurring?
21 Risk Factors (for Women) Unsafe transfusion Unsafe injection practices Unsafe injection drug use Unsafe sex
22 Distribution of AIDS cases by the route of transmission Eastern Europe 100% 80% 60% 40% 20% 0% < MSM IDU Homo/Bisexual Haemophilia Transfusion Heterosexual Other/including MTCT
23 Concept of Bridging Populations in HIV Transmission Concentrated epidemics Generalized epidemics Core (risk) group Bridging population General population IDUs, sex workers, MSMs Sex partners of IDUs, sex workers, MSMs 1. Sexual norms 2. STIs
24 Sexual Transmission of STIs, Including HIV 1 R o =β c D R o = reproductive rate β =transmission efficiency C=rate of partner change D=duration of infectiousness 1 among people having sex Anderson and May
25 Male to Female Transmission Efficiency Study Per 1000 acts Padian et al (1987) Peterman et al (1988) Wiley et al (1989) Duerr et al (1994) Downs et al (1996) Leynaert et al (1998) Shiboski et al (1998) Gray et al (2001) Combined male to female with female to male
26 ß (Transmission efficiency) Cofactors Cofactor effect of STIs Cofactor effect of young age Cofactor effect of hormonal contraceptives Negative cofactor effects of condom use Negative cofactor effect of microbicides (we hope!) Negative cofactor effect of circumcision (we think but now March 2007 we are sure!)
27 ß (Transmission efficiency) Model Concentration of virus in seminal secretions 1 Viral phenotype Number of receptors for HIV in endocervix (or vagina) 1 Chakraborty H et al. AIDS 2001;15:621
28 Seminal Fluid Characteristics, 132 Samples CD4 count Semen volume (ml) Median 2.4 Minimum 0.1 Maximum 7.3 NSI HIV-1 RNA count per sample Median 4,904 Mean 522,656 Minimum 42 Maximum 27,870,835 Chakraborty H et al. AIDS 2001;15:621
29 CCR5 Receptor Cell Count, Endocervix Median 184/mm 3 Mean 176/mm 3 Minimum 13/mm 3 Maximum 450/mm 3 Chakraborty H et al. AIDS 2001;15:621
30 Probability of Transmission by Seminal Viral Load, Number of Receptor Cells, or Proportion of HIV Virions that are NSI % NSI or many receptor cells Seminal viral load, log 10 Chakraborty H et al. AIDS 2001;15:621 50% NSI or few receptor cells
31 ß (Transmission efficiency) Cofactors again Amount of seminal secretions Young age STIs, Etc. Review! Coombs RW et al. AIDS 2003;17:455
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37 Presence of HIV in Ulcer Secretions Disease PCR for HIV (Pos./Tested) Chancroid 2 6/7 (86%) Chancroid 3 2/6 (33%) Syphilis 1/2 (50%) Unknown 2/3 (67%) Genital herpes 1/3 (33%) Genital herpes 4 25/26 (96%) 1 Kreiss J et al. J Infect Dis 1989;160:380 2 Plummer FA et al. J Infect Dis 1990;161:810 3 Mertz KJ et al. J Infect Dis 1998;178:1795 Schacker T et al. JAMA 1998;280:61
38 HIV prevalence rate and frequency of sexually transmitted infection (STI) episodes, Carletonville miners, South Africa, HIV prevalence (%) Number of STI episodes Source: Ballard R, 2000 (unpublished data).
39 Probability of Transmission by Seminal Viral Load, Number of Receptor Cells, or Proportion of HIV Virions that are NSI % NSI or many receptor cells Seminal viral load, log 10 Chakraborty H et al. AIDS 2001;15:621 50% NSI or few receptor cells
40 If These Transmission Efficiencies are so Low, Why is there an HIV Epidemic?
41 Cohort study, Nairobi 73 HIV-negative men with an STD All men had had one act of sexual intercourse with a prostitute The men were counseled, given condoms, told to avoid sex with prostitutes, and followed every 2 weeks for three months for HIV seroconversion 85% of prostitutes were HIV-positive Cameron WD et al. Lancet 1989;2:403 Cameron D et al. Lancet 1989;2:403
42 Proportion of Men Developing HIV Infection After a Single Act of Sexual Intercourse Circumcised Uncircumcised Unstratified Urethritis Ulcer Urethritis Ulcer 13% 0% 7% (6*) 0% 43% (15) Standard Error Attributable risk due to lack of circumcision and genital ulcer=98% Cameron WD et al. Lancet 1989;2:403
43 An Outbreak of HIV Infection, United States Of 42 teenaged girls having only vaginal sex with one teenaged boy, 13 (31%) became infected Of 15 girls with a brief time period of sexual activity, seven (47%) became infected. Infected girls, compared to uninfected girls, had more exposures: Partners Infected Uninfected Median 3 1 Range MMWR 1999;48:413
44 Sexual Transmission of STIs, Including HIV 1 R o =β c D R o = reproductive rate β =transmission efficiency C=rate of partner change D=duration of infectiousness 1 among people having sex Anderson and May
45 Alternately, Maybe Something Else is Going On?
46 Unsafe Injections in the Developing World WHO estimates that 5% of all infections, worldwide, are from unsafe injections (2.5% in sub- Saharan Africa)
47 Injections Given with Sterile and Unsafe Equipment Worldwide South America Central Europe West Africa China and Pacific South East Asia East and Southern Africa Injections given with equipment re-used in the absence of sterilization Injections given with sterile equipment Eastern Europe and Central Asia South Asia Middle East Crescent Number of injections per person and per year
48 Dr Tanu Singhal, London School of Hygiene and Tropical Medicine
49 The Solution to Pollution is Dilution
50 In Addition, HIV Acts Like an STI
51 Percent infected Figure 1 HIV prevalence by age and sex, Addis Ababa, Ethiopia, 1994 (ref. 52) Men Women Age group
52 Percent infected Figure 2A HIV and HSV-2 prevalence by age and sex in Kisumu, Kenya Age group HIV men HSV-2 men HIV women HSV-2 women
53 Figure 4 Infection Rates, by Gender, Carletonville, South Africa
54 What Can We Do About the HIV Epidemic?
55 The HIV Epidemic Should Be Easily Controlled 1. Don t have unsafe transfusions 2. Don t have unsafe injections 3. Don t inject drugs (if you do, do it safely) 4. Don t have sex (if you do, do it safely)
56 Stopping the HIV Epidemic Personal Responsibility Giving people the means to effect personal responsibility
57 Don t have sex (if you do, do it safely) 1. Education
58 Percentage who do not know Percentage of girls who do not know that an HIV-infected person may look healthy, Sources: UNICEF, DHS surveys and other nationwide surveys,
59 Risk perception percentage of sexually active women (15-19) who perceive themselves to be at no risk of getting AIDS Nicaragua Nepal Colombia Bolivia Guatemala Brazil Dominican Rep. Niger Benin Chad Mali Cameroon Togo Haiti CAR Kenya Uganda Zambia Zimbabwe HIV Prevalence (at time of survey *) Percentage of year old girls who think they are not at risk of AIDS *HIV prevalence in women attending antenatal care clinics in major urban areas Sources: UNICEF, DHS surveys,
60 Benin Cameroon Central Arican Republic Chad Kenya Malawi Mali Niger United Republic of Tanzania Togo Uganda Zambia Zimbabwe Brazil Dominican Republic Percentage of men who used a condom with a recent non-regular partner, by level of formal education: None Primary Secondary or more Source: Macro International ( ) Demographic and Health Surveys; UNICEF
61 Don t have sex (if you do, do it safely) 1. Education 2. Change societal norms
62 Pre-marital sex % of women (age 20-24) that report pre-marital sex, various countries in Eastern Europe % Georgia (1999) Moldova (1997) Romania (1999) Ukraine (1999) Russia (1999) Czech Republic (1993)
63 Two "Drivers" of the HIV Epidemic
64 Male Circumcision--1 (which may require changing norms) A biologic intervention Probably the intervention with the strongest and most consistent evidence that it works ~60% reduction in HIV infection in circumcised men* Women will benefit: Lower population prevalence Women may be protected (although, biologically, how is uncertain) *March 2007 WHO/UNAIDS conference for summary mid-march
65 Avoid Concurrent Partnerships--2 (may require changing norms) Concurrent partnerships, as opposed to sequential partnerships, are particularly dangerous.
66 Transmission efficiency Mathematical models estimate the average probability of male female transmission of HIV-1 per unprotected coital act to be between and 0.003% during chronic HIV infection, which in itself would not sustain an epidemic. -Pao et al, AIDS (2005)
67 Don t have sex (if you do, do it safely) 1. Education 2. Change societal norms 3. Enable safe behaviours
68 Condoms per man per year Condom gap in sub-saharan African countries in Additional condoms needed to get all countries to the level of 16.9 = 1.9 billion per year Average condom procurement of top 6 countries = 16.9 Six countries with highest condom procurement rate Countries in sub-saharan Africa, ordered by condom procurement rate Source: Shelton JD, Johnston B (2001) Condom gap in Africa: evidence from donor agencies and key infromants, British Medical Journal
69 Concept of Bridging Populations in HIV Transmission Concentrated epidemics Generalized epidemics HIV+ HIV- HIV- HIV+ HIV- HIV+ Core (risk) group Bridging population General population 1. Sexual norms 2. STIs
70 Concept of Bridging Populations in HIV Transmission Concentrated epidemics Generalized epidemics? HIV+?? Core (risk) group Bridging population General population 1. Sexual norms 2. STIs
71 Concept of Bridging Populations in HIV Transmission Testing Care "Provider Initiated Testing & Counseling"--2007? HIV+?? Core (risk) group Bridging population General population 1. Sexual norms 2. STIs
72 Care Purposes (benefits) Medical, psychological, social care Altering behaviour Challenges Decreasing stigma Streamlining counseling and testing Financial Operational
73 Women's access to HIV treatment, June 2006 Mozambique Uganda Nigeria Malawi Zimbabwe Zambia Central African Republic Botswana Kenya Côte d'ivoire Namibia Rwanda United Republic of Tanzania Burundi South Africa 10% 20% 30% 40% 50% 60% 70% Percentage of adults on ART who are women Percentage of HIV-infected persons who are women
74 Children's access to HIV treatment, June 2006 Africa Median: 8% Latin America Median: 8% Asia Median: 5 %
75 (Percentage coverage) Access to PMTCT services in sub-saharan Africa, Togo Namibia Zambia Guinea Bissau Benin Central African Republic Swaziland Burundi Uganda Percentage of HIV-infected pregnant women receiving ARV prophylaxis for PMTCT Gabon Rwanda Kenya Zimbabwe Lesotho Mozambique Côte d'ivoire
76 Concept of Bridging Populations in HIV Transmission Concentrated epidemics Generalized epidemics HIV+ HIV- HIV- HIV+ HIV- HIV+ Core (risk) group Bridging population General population 1. Sexual norms 2. STIs
77 Success Story (Why?)
78 Prevalence Prevalence among pregnant women in major urban areas, Uganda Source: Uganda National AIDS Programme
79 Ugandans aged reporting virginity, Male Female
80 ABC trends in Uganda Sexual deferral important, in itself and as determinant of subsequent sexual behavior Later sexual debut may be associated with fewer partners in adulthood
81 Ugandan females reporting no casual sex in past year, Urban Rural
82 Condom use among men with non-regular partners over time in selected sub-saharan African countries: % Malawi Tanzania Uganda Zambia Source: Macro International ( ) Demographic Health Surveys; Measure Evaluation
83 Summary 1. HIV/AIDS is a HUGE problem in the world 2. Women make up ½ of cases 3. Altering the course of the epidemic is theoretically simple, but operationally difficult
84 Thank you!
HIV in Women: A Global View of the HIV Epidemic
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