Hair Mercury Level is Associated with Anemia and Micronutrient Status in Children Living Near Artisanal and Small-Scale Gold Mining in the Peruvian Amazon

Caren Weinhouse Duke Global Health Institute, Duke University, Durham, North Carolina;

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Ernesto J. Ortiz Duke Global Health Institute, Duke University, Durham, North Carolina;

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Axel J. Berky Duke Global Health Institute, Duke University, Durham, North Carolina;

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Paige Bullins Duke Global Health Institute, Duke University, Durham, North Carolina;

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John Hare-Grogg Civil and Environmental Engineering, Duke University, Durham, North Carolina;

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Laura Rogers Civil and Environmental Engineering, Duke University, Durham, North Carolina;

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Ana-Maria Morales Centro de Estudios, Investigación y Servicios en Salud Publica, Lima, Peru;

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Heileen Hsu-Kim Civil and Environmental Engineering, Duke University, Durham, North Carolina;
Nicholas School of the Environment, Duke University, Durham, North Carolina

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William K. Pan Duke Global Health Institute, Duke University, Durham, North Carolina;
Nicholas School of the Environment, Duke University, Durham, North Carolina

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Anemia has been widely studied in global health contexts because of severe nutritional deficiency, and more recently, inflammatory status, but chemical exposures are rarely considered. Until recently, “anemia” was used synonymously with “iron deficiency anemia (IDA)” in global health settings. However, only 50% of anemia cases worldwide are IDA. Environmental toxicology studies of anemia risk have generally focused on populations in developed countries, albeit with high exposure to environmental toxicants, such as lead or cadmium. In the developing world, toxicant exposures commonly coexist with other risk factors for anemia. In particular, artisanal and small-scale gold mining (ASGM) communities are at risk for dietary methylmercury exposure through contaminated fish consumption, and for anemia due to food insecurity and infectious and chronic diseases. Here, we report analysis of total hair mercury content, hemoglobin, and serum micronutrient levels in children < 12 years of age (N = 83) near ASGM in the Peruvian Amazon. Forty-nine percent (N = 29/59) of those aged < 5 years were anemic (< 11 g/dL) and 52% (N = 12/23) of those aged 5–11 years (< 11.5 g/dL). Few children were stunted, wasted, or micronutrient deficient. Median total hair mercury was 1.18 μg/g (range: 0.06–9.70 μg/g). We found an inverse association between total mercury and hemoglobin (β = −0.12 g/dL, P = 0.06) that persisted (β = −0.14 g/dL, P = 0.04) after adjusting for age, sex, anthropometrics, and vitamin B12 in multivariate regression. This study provides preliminary evidence that methylmercury exposure is associated with anemia, which is especially relevant to children living near ASGM.

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Author Notes

Address correspondence to William K. Pan, Global Environmental Health, Duke Global Health Institute, 310 Trent Drive, Room 227, Durham, NC 27710. E-mail: william.pan@duke.edu

Financial support: This work was supported by a grant from Hunt Peru LLC. Support for C. W. was provided by the Inter-American Institute for Global Change Research (CRN #3036) and a Duke Global Health Institute postdoctoral fellowship.

Authors’ addresses: Caren Weinhouse, Ernesto J. Ortiz, and Paige Bullins, Duke University, Duke Global Health Institute, Durham, NC, E-mails: caren.weinhouse@duke.edu, ernesto.ortiz@duke.edu, and paige.meier@duke.edu. Axel J. Berky, Duke University, Nicholas School of the Environment, Durham, NC, E-mail: axel.berky@duke.edu. John Hare-Grogg and Laura Rogers, Duke University, Civil and Environmental Engineering, Durham, NC, E-mails: jwhg94@gmail.com and laura.rogers@duke.edu. Ana-Maria Morales, Centro de Estudios, Investigación y Servicios en Salud Publica, Centro de Estudios, Investigación y Servicios en Salud Publica, Lima, Peru, E-mail: anamorales30@hotmail.com. Heileen Hsu-Kim, Duke University, Civil and Environmental Engineering, Duke Global Health Institute, Durham, NC, E-mail: hsukim@duke.edu. William K. Pan, Duke University, Nicholas School of the Environment, Duke Global Health Institute, Durham, NC, E-mail: william.pan@duke.edu.

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