Abstract
BackgroundIn South Africa, the severity of the HIV/AIDS epidemic varies according to geographical location; hence, localized monitoring of the epidemic would enable more effective prevention strategies. Our objectives were to assess the core areas of HIV infection in KwaZulu-Natal, South Africa, using epidemiological data among sexually active women from localized communities.MethodsA total of 5753 women from urban, peri-rural and rural communities in KwaZulu-Natal were screened from 2002 to 2005. Each participant was geocoded using a global information system, based on residence at time of screening. The Spatial Scan Statistics programme was used to identify areas with disproportionate excesses in HIV prevalence and incidence.ResultsThis study identified three hotspots with excessively high HIV prevalence rates of 56%, 51% and 39%. A total of 458 sexually active women (19% of all cases) were included in these hotspots, and had been exclusively recruited by the Botha's Hill (west of Durban) and Umkomaas (south of Durban) clinic sites. Most of these women were Christian and Zulu-speaking. They were also less likely to be married than women outside these areas (12% vs. 16%, p = 0.001) and more likely to have sex more than three times a week (27% vs. 20%, p < 0.001) and to have had more than three sexual partners (55% vs. 45%, p < 0.001). Diagnosis of genital herpes simplex virus type 2 was also more common in the hotspots. This study also identified areas of high HIV incidence, which were broadly consistent with those with high prevalence rates.ConclusionsGeographic excesses of HIV infections at rates among the highest in the world were detected in certain rural communities of Durban, South Africa. The results reinforce the inference that risk of HIV infection is associated with definable geographical areas. Localized monitoring of the epidemic is therefore essential for more effective prevention strategies - and particularly urgent in a region such as KwaZulu-Natal, where the epidemic is particularly rampant.
Highlights
In South Africa, the severity of the HIV/AIDS epidemic varies according to geographical location; localized monitoring of the epidemic would enable more effective prevention strategies
We investigated the geographical clustering of HIV infection using data from six geographical strata; these came from two of the unit’s site-preparedness studies and one HIV prevention phase III clinical trial of vaginal diaphragms
Study areas and geographical data We combined data from 5753 sexually active women who consented to screening for three studies from six clinics and 158 census locations included in this study
Summary
In South Africa, the severity of the HIV/AIDS epidemic varies according to geographical location; localized monitoring of the epidemic would enable more effective prevention strategies. Our objectives were to assess the core areas of HIV infection in KwaZulu-Natal, South Africa, using epidemiological data among sexually active women from localized communities. In South Africa’s province of KwaZulu-Natal, the epidemic is at the most advanced stage, with HIV prevalence among mothers attending antenatal clinics estimated to be 39% [2]. Use of current HIV prevention methods, such as condoms, monogamy and abstinence, is not always realistic in practice for many reasons. Researchers are trying to develop an effective microbicide that could be used by women to help prevent HIV transmission. Clinical trials of the efficacy of microbicides have so far proved disappointing [4,5,6,7]
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