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Although the sub-Saharan region accounts for just 10% of the world’s population, 67% (22.5 million) of the 33.4 million people living with HIV/AIDS in 1998 were residents of one of the 34 countries of sub-Saharan Africa, and of all AIDS deaths since the epidemic started, 83% have occurred in sub-Saharan Africa (Gilks, 1999, p. 180). Among children under age 15 living with HIV/AIDS, 90% live in sub-Saharan Africa as do 95% of all AIDS orphans. In several of the 34 sub-Saharan nations, 1 out of every 4 adults is HIV-positive (UNAIDS, 1998, p. 1). Taxing low-income countries with health care systems inadequate to handle the burden of non-AIDS related illnesses, AIDS has devastated many of the sub-Saharan African economies. The impact of AIDS on the region is such that it is now affecting demographics - changing mortality and fertility rates, reducing lifespan, and ultimately affecting population growth.
Although Africa is the region of the world hardest hit by AIDS, and although no country has entirely escaped the virus, prevalence rates vary dramatically between regions, countries, and even within countries. In general, the southern region is the most affected, with Botswana, Namibia, Swaziland and Zimbabwe showing the highest rates, while West Africa has been less affected. In almost all countries, the HIV/AIDS prevalence rate is significantly higher in urban areas than in rural areas.
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In recent years an intensive government-sponsored HIV prevention campaign focusing on use of condoms and changes in sexual behavior has produced impressive results. Researchers however, have yet to satisfactorily explain the broad variation in HIV seroprevalence between Western and Eastern sub-Saharan Africa. As Gilks (1999) observes, “in some of the countries of Western Africa such as Senegal, low levels of HIV prevalence in adults have been maintained for about a decade, despite many circumstances highly conducive to appreciable and sustained transmission” (p. 181). In some Western African nations, early and sustained prevention programs may be responsible for the differences, although other reports indicate that comparatively low transmission rates prevail in most of the Western countries regardless of programs designed to encourage safer sex (UNAIDS, 1998, p. 2). Reports also show that differences in the rate of HIV spread between East and West Africa cannot be explained by differences in sexual behavior alone.
AIDS researchers typically make a distinction between concentrated and generalized transmission patterns of the virus. In a concentrated transmission pattern, infection tends to be concentrated within “vulnerable groups” such as homosexual men, prostitutes, and IV drug users. In the generalized pattern, infection is diffused broadly through the population, typically by means of heterosexual transmission. In sub-Saharan Africa, where heterosexual transmission predominates, the pattern is that of generalized transmission. Compared to the U.S. little HIV transmission in Africa is related to IV drug use or unprotected homosexual sex. In addition to heterosexual transmission, transmission via transfusion and through contaminated medical equipment is not uncommon in sub-Saharan Africa. Africans infected with HIV die much sooner after diagnosis than HIV-infected persons in other parts of the world. Studies in industrialized countries that were conducted prior to the introduction of treatment with multiple antiretroviral drugs, found that the survival time following the diagnosis of AIDS ranged from 9 to 26 months. However, in Africa the survival time of patients with AIDS ranged from 5 to 9 months (Unaids, 1998, p.2). A number of factors have been cited to explain the shorter survival times in African which include lower access to health care, poorer quality of health care services, poorer levels of baseline health and nutrition, and greater exposure to pathogens likely to result in opportunistic infection and early death (UNAIDS, 1998; UNAIDS, 1999; Gilks, 1999).
Mortality & Life Expectancy. There is now compelling evidence drawn from two decades of AIDS epidemic data in central and east Africa that the AIDS epidemic has had a dramatic and negative impact upon mortality rates and life expectancy in this region. The most substantial increases in the mortality rate have occurred among adults aged 20 to 40 in the southern and eastern regions of sub-Saharan Africa, with more modest mortality rate increases shown for children within this region. The probability that a male adult in Zimbabwe would die between the ages of 15 and 60 jumped from 0.181 in 1979 to 0.325 in 1992, while the probability that a female adult would die between these ages during this time period jumped from 0.248 to 0.419 (Timaeus, 1998, p. S21). The increased mortality rates have had a substantial impact on life expectancies in the affected regions. A study in rural Uganda found that life expectancy dropped from just under 60 years to 42.5 years during the past two decades (Boerma, Nunn & Whitworth, 1998). In late 1998, the UN Population Division released figures suggesting that AIDS has taken an average of seven years off the average life expectancy at birth of a baby born in any of the 29 most affected African countries. On average, in the absence of AIDS, life expectancy for these 29 countries would have averaged 54 years; now, however, the average has dropped to 47 years.
Fertility. A number of studies have now documented that HIV infection significantly reduces the fertility levels of HIV+ women in the sub-Saharan African countries. Studies on fertility changes in 20 sub-Saharan African countries found a 25% to 40% decline in fertility among HIV+ women versus their HIV-negative counterparts in the same country. Researchers note that HIV decreases fertility among HIV+ women as a consequence of both biological (impact on fecundity) and behavioral factors. On the biological level, there is an increase (among HIV+ women) in menstrual disorders, miscarriages, other STDs, and partner mortality - all of which negatively impact fertility. On the behavioral level, HIV+ status may prompt increased divorce and separation, increased use of condoms and/or other barrier contraceptives, and reduced sexual frequency (Zaba & Gregson, 1998; Gregson, et al., 1999). Biological and behavioral factors among HIV+ men may also impact the fertility rates. In general, researchers have noted that biological factors, including reduced sperm count and reduced frequency of sexual activity related to physical illness, have been more important than behavioral factors (condom use, etc.) when examining males’ contributions to the declining fertility rates (Zaba & Gregson, 1998).
Orphanhood & Early Childhood Mortality. The data on child mortality and AIDS are more confusing. There is no doubt that AIDS has had a devastating impact on children in Africa. The majority of the world’s estimated 1.1 million HIV+ children live in the hard-hit sub-Saharan African nations (Boyle, 1998, p. 1). Most children become infected in utero through maternal-to-fetus transmission or soon after birth through breast-feeding. The risk of breastfeeding-related HIV transmission is very high - estimated at 29% to 34% if primary HIV infection of the mother occurs during lactation (Boyle, 1998, p. 1). By the end of the year 2000, some 13 million children will have been orphaned by AIDS; 95% of these orphans live in sub-Saharan countries (Altman, 1999b, p. 1). As of 1997 11% of all children in Uganda, 9% of children in Zambia and 7% of children in Zimbabwe were AIDS-related orphans, having lost both parents to AIDS (Altman, 1999b, p. 2). At this point, most analysts view orphanhood as a more serious problem in sub-Saharan Africa than increases in child mortality. Children who are the victims of double orphanhood often place an impossible financial and social burden on elderly grandparents and are at high risk for labor exploitation and/or recruitment into gangs and militias.
Gender Effects: The Case of Women. In the developed nations of the world, women constitute about 20% of all HIV-positive adults (Altman, 1999a, p. 4). This gender imbalance is primarily related to the concentrated pattern of transmission
where the greatest number of cases are among male homosexuals and IV drug users. However, in sub-Saharan Africa, the gender pattern is much different. Researchers have long observed a fairly even gender distribution among African AIDS cases which is attributed to the generalized pattern of heterosexual transmission. Recently released official data has revealed that 12.2 million or 55% of the 22.3 million HIV+ adults in sub-Saharan Africa are female (Altman, 1999a, p. 1). The African HIV gender disparity is particularly dramatic at the younger ages. In many sub-Saharan African countries, the incidence of HIV infection among girls between the ages of 15 and 19 years old is six to eight times that of their male counterparts (Reuters Health, 1999a, p. 1). A number of social and cultural factors are responsible for this discrepancy, including the high rates of rape in many African countries, the low age of sexual initiation among females, and the age disparity between young women and their first male sexual partners who alot of times are middle-aged men seeking virgins as sexual partners to ward off AIDS.
Population-Wide Effects. Over time, higher-than-expected mortality rates and lower-than-expected fertility rates will have an impact on population growth. To date, hard data on the population-wide impact of AIDS have been limited. Preliminary data from some of the hardest-hit countries suggest that AIDS has already begun to effect population growth rates. A 1998 UN report found that the high AIDS-related mortality rate in Zimbabwe had depressed population growth during the late 1980s and early 1990s. Between 1980 and 1985, Zimbabwe’s population grew at 3.3% per year. By 1998, the annual growth rate had dropped to 1.4% and was projected to fall to less than 1% beginning in 2000 (Ibrahim, 1998, p. 1).
In conclusion the AIDS epidemic is devastating African society. Historically, few epidemics have resulted in such widespread, devastating demographic effects. Thus far, the AIDS epidemic in sub-Saharan Africa has decreased fertility rates, increased mortality rates, shortened average life expectancy, increased the rate of orphanhood, and disrupted family structure. It is now poised to decimate population growth rates and alter the gender ratio. The epidemic may well change the social and economic fabric of sub-Saharan Africa in ways that are not yet understood or anticipated. An International Labor Office report released in October of 1999 warned that “HIV/AIDS has now become the single most important obstacle to social and economic progress in many countries in Africa” and noted that the epidemic in the region has shifted from being primarily a health problem to being “a development problem with potentially ominous consequences” (Reuters Health, 1999b, p. 1). Preliminary studies suggest that the economic consequences of the AIDS epidemic will be no less devastating than the demographic consequences. Direct economic consequences include the costs of medical care and social programs related to the epidemic while indirect consequences include factors such as dwindling labor productivity as the young, economically productive population takes ill and/or dies. Solving the development problem of the AIDS epidemic in sub-Saharan Africa will require not only massive amounts of foreign aid and expertise, but also a massive social transformation. Through AIDS-prevention programs aimed at increasing condom use, reducing high-risk sexual behaviors, improving HIV screening, promoting alternatives to breastfeeding, and reducing social stigma associated with AIDS there can be a positive and measurable impact on HIV prevalence or else the Aids Epidemic will continue to claim the lives of millions and millions of Africans.