AIDS in Developing Countries

Transcription

1 AIDS in Developing Countries

2 MODES OF TRANSMISSION Blood Semen/genital secretions Vertical

3 RISK ACTIVITIES THAT PROMOTE TRANSMISSION OF HIV Receiving blood contaminated with HIV Being born to an HIV-infected mother Engaging in anal intercourse with an HIV-infected partner Engaging in vaginal intercourse with an HIV-infected partner Engaging in oral-genital intercourse with an HIVinfected partner Sharing needles with an HIV-infected individual Being exposed to HIV-infected material; e.g., health or laboratory worker

4 RISK GROUPS Homosexual/bisexual Intravenous drug users Promiscuous heterosexuals Blood product and organ recipients Children of infected individuals Health/laboratory workers Partners of HIV-infected individuals

5 Cohen MS: HIV prevention: rethinking the risk of transmission. Intl AIDS Vaccine Res 8(3):2, September-November, 2004.

6 Cohen MS: HIV prevention: rethinking the risk of transmission. Intl AIDS Vaccine Res 8(3):3, September-November, 2004.

7 Spread of HIV in Africa,

8 Spread of HIV in Central and South America,

9 Spread of HIV in eastern Europe and central Asia,

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11 Spread of HIV in Asia,

12 Source: Sentinel surveillance surveys and IBBS

13 Source: Sentinel surveillance surveys and IBBS

14 Source: Sentinel surveillance surveys and IBBS

15 Source: Sentinel surveillance surveys and IBBS

16 Asia (East, Southeast, and South) Number HIV+:4.9 million ( million) Incidence stable: Most countries Incidence rising: Philippines Bangladesh Pakistan

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18 Cambodia (2009) Prevalence: 0.6% Risk groups: MSM Non-brothel sex workers Mother-to-child (1/3 of total)

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20 Spread of HIV over time in China,

21 India Prevalence of HIV: Risk groups: 0.3% (2.31 million) 39% of total are females Injection drug users (northeast, Tamil Nadu) Sex workers (south and west) Truck drivers Migrant workers MSM Monogamous wives

22 Indonesia (2009) Number HIV+: 314,000 (<0.2%) Risk groups: Injection drug users Sex workers (male & female) MSM (prevalence 5%)

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24 Malaysia HIV/AIDS prevalence: 0.6% Percent who are women: 20% (2006) Risk groups: Injection drug users (majority) Sex workers (male & female)

25 The Philippines Number HIV+ 8,700 (<0.47% ) Risk groups Sex workers MSM Injection drug users

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27 Timor-Leste HIV/AIDS prevalence: 0.2% Risk groups: Sex workers (3% HIV prevalence) Men who have sex with men (1% HIV prevalence)

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29 SW=sex worker; MSM=men who have sex with men; IDU=intravenous drug users Publications/ / /part1hivaidsfeb2009.pdf

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37 Blood: HIV Testing Strategies 1. Resistance to invasive procedures 2. Problems of processing and transport 3. Tests ELISA Electrophoretic techniques - the Western blot Rapid testing Viral load PCR; p24 antigen

38 HIV Testing Strategies Urine testing: 1. Non-infectious material 2. Non-invasive 3. Difficulty of collecting 4. Preservation of urine 5. Ease of transport 6. Problem of assuring source of specimen 7. Reasonable sensitivity and specificity

39 HIV Testing Strategies Saliva testing: 1. Non-infectious material 2. Non-invasive 3. Easily collected 4. Ease of transport 5. Good sensitivity and specificity 6. Rapid tests

40 HIV Testing Strategies Pooling: 1. For screening/surveillance, not counseling 2. Cost-effectiveness decreases with increasing prevalence

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43 Viral Testing Culture Expensive Technically demanding Virus particles Polymerase chain reaction (amplifies virus) Expensive Requires sophisticated technology p24 antigen Less accurate

44 Lymphocyte counts CD3, CD4, CD8, etc. Flow cytometry FACS analysis Requires sophisticated technology Expensive

45 Alternate Testing Total lymphocyte counts Inexpensive Simple technology CD4:CD8 equilibrium results in changing relationship of subsets CD4/TLC curves not parallel Low sensitivity p24 acid-dissociated Ag Low sensitivity Low cost Low technology Serologic tests for T-cells (e.g., Dynabeads)

46 Testing Strategies Voluntary counseling and testing (opt-in) Routine testing (opt-out) Mobile testing Home testing Mail-in/phone for results Rapid test self read in 1 20 minutes Confirmatory testing

47 FACTORS AFFECTING SPREAD OF HIV-1 BIOLOGIC Co-prevalence of other STDs Circumcision status Stage of HIV infection Viral load Treatment availability access and cost

48 FACTORS AFFECTING SPREAD OF HIV-1 BEHAVIORAL Roles of males and females Cultural acceptance of multiple partners Types of intercourse (vaginal, anal) Customs involving penetration of skin Concurrency of multiple sex partners (sexual mixing) Condom use Drug use (injection and non-injection)

49 FACTORS AFFECTING SPREAD OF HIV-1 POLITICAL/ECONOMIC Political commitment Attitudes toward risk groups Legal status of risk groups Attitudes toward specific sex education Acceptability and ease of access to testing Status of women Level of stigma Poverty Availability and access to testing and treatment

50 FACTORS AFFECTING SPREAD OF HIV-1 DEMOGRAPHIC High proportion of year-olds High male:female ratio Rapid urbanization Use of trucks for transport of goods Large migrant population rural to urban Proportion of circumcized males

51 Impact of the HIV/AIDS Epidemic in Developing Countries Alteration of the Producer:Dependent Ratio Decreased productivity due to illness Removal of producers by death Increased number of dependents: Sick babies Increased number of orphans

52 Impact of the HIV/AIDS Epidemic in Developing Countries Increased Health Care Costs Diversion of funds from other urgent health problems Issues and costs of care and hospitalization Need for trained health providers

53 Impact of the HIV/AIDS Epidemic On the Individual Uncertain future Contemplating painful death Stigmatization and social isolation Loss of employment Limited access to health care Loss of self-esteem

54 Impact of the HIV/AIDS Epidemic On the Family Potential infection of spouse and children Loss of economic support of family Ostracism and social isolation Children become orphans

55 Impact of the HIV/AIDS Epidemic On Society Loss of productive segment of society Increased number of dependents Breakdown of family structure Sense of fear and distrust Huge burden of long-term treatment of HIV patients

56 Impact of the HIV/AIDS Epidemic in Developing Countries Political impact Political instability Increased dependency on rich nations

57 BARRIERS AGAINST HIV/AIDS CONTROL (1) Status of women Low condom acceptance (esp. non-commercial sex) Dependence on external support Long-term sustainability of external support Low awareness/acceptance of vulnerability (women/youth) Low acceptance of testing (misguided emphasis on opt-in and individual rights) Insufficient funds for prevention/intervention Stigma (risk groups, HIV-infected, those seeking testing)

58 BARRIERS AGAINST HIV/AIDS CONTROL (2) High proportion of uncircumcised men Cost and complexity of adult circumcision Low acceptance of circumcision Low literacy rates Few female-controlled prevention strategies (e.g. microbicides) Vaccine unlikely in the near future Cost of control and treatment Reaching unknown HIV-infected persons Continuum of care

59 International Support of HIV/AIDS Treatment (Gates, Clinton, PEPFAR, etc.) Buys needed drugs Need for infrastructure Source? Existing health personnel Undermining public health infrastructure or separate infrastructure Distribution Adherence and counseling Long-term problems Lets local governments off the hook Sustainability NGOs lose interest Capacity of government to absorb

60 Current HIV/AIDS Problems in Developing Countries (1) Need for more widespread testing Testing of hidden HIV+ individuals Human rights who are you protecting? Continuum of care Hidden populations (e.g., married MSM) Persisting stigma

61 Current HIV/AIDS Problems in Developing Countries (2) Treatment Cost of drugs Monitoring clinical course Assuring adherence Reaching rural areas Impact of huge HIV/AIDS-directed funds on: Public health programs Government responsibility Sustainability what happens when donors lose interest?

62 Percentage of persons with HIV engaged in select states of the continuum of care in the United States, by race/ethnicity

63 Current HIV/AIDS Problems in Developing Countries (3) Treatment as prevention Maintaining effort and funding Implementing and funding for prophylactic treatment of vulnerable populations Reaching unknown HIV-infected persons Continuum of care

64 SUMMARY Despite progress made in many countries and the declining trend of new HIV infections, AIDS is still a leading cause of morbidity and death among adults Early successes in controlling HIV epidemics may not be sustainable in the future if continued commitment to care and prevention is not secured