Elevated mercury exposure in communities living alongside the Inanda Dam, South Africa.

Mercury is a persistent heavy metal that has been associated with damage to the central nervous system, including hearing and speech impairment, visual constriction and loss of muscle control. In aquatic environments mercury may be methylated to its most toxic form, methyl-mercury. In 1990 concerns were raised over mercury contamination in the vicinity of a mercury processing plant in KwaZulu-Natal, South Africa. Mercury waste was reported to have been discharged into the Mngceweni River, situated in close proximity to the plant. The Mngceweni River joins the uMgeni River, which in turn flows into the Inanda Dam, along the banks of which several villages are located. This study evaluated the mercury levels in river and dam sediments, fish from the Inanda Dam and hair samples collected from residents of three villages along the banks of the Inanda Dam. The study results showed that 50% of the fish samples and 17% of hair samples collected from villagers had mercury concentrations that exceeded guideline levels of the World Health Organization. Mercury concentrations in 62% of the river sediment samples collected in close proximity to the former mercury processing plant exceeded the level at which remedial action is required according to legislation in the Netherlands. These preliminary findings give reasons for concern and should be used as a baseline for further investigations.

The social distribution of explanations of health and illness among adolescents in São Paulo, Brazil.

The present paper reports on a study, which investigated explanations of health and illness among adolescents from three socio-economic backgrounds in São Paulo, Brazil. Interviews and group discussions were used to elicit definitions of health and illness, explanations of illness causality and prevention and maintenance of health among 31 deprived adolescents with recent experience of living on the streets, 20 adolescents from poor families and 20 adolescents from privileged families. The findings showed that adolescents from different socio-economic conditions draw upon similar explanatory models to make sense of health and illness. There were also clear distinctions between the groups. Health and illness were presented as being dependent upon multiple factors such as resistance of the body and socio-economic status among privileged adolescents. In contrast, the explanations offered by deprived and poor adolescents for both health and illness rested on behaviour or exposure to environmental hazards. Moreover, drugs, sexually transmitted diseases and faith in God were prominent features of the accounts from deprived adolescents. The findings suggest a need for health professionals to be sensitive to people's perspectives of health and illness and their link to socio-economic conditions. To emphasize individuals' behaviour in the provision of health-related information among deprived adolescents might be counter productive and reinforce victim blaming.