Onchocerciasis in Colombia

Entomologic Findings in the First Observed Focus

Pablo Barreto Departamento de Microbiologia, Facultad de Medicina, Universidad del Valle, Cali, Colombia

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H. Trapido Departamento de Microbiologia, Facultad de Medicina, Universidad del Valle, Cali, Colombia

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V. H. Lee Departamento de Microbiologia, Facultad de Medicina, Universidad del Valle, Cali, Colombia

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At the first observed focus of onchocerciasis in man in Colombia, the principal and almost only Simulium found biting man was S. exiguum. This species by exclusion appears to be the vector of onchocerciasis at the focus studied, the settlement of San Antonio on the Río Micay. The numbers of S. exiguum biting man were very much greater at San Antonio, where the Micay breaks out of the Western Cordillera of the Andes, than at López, 2 or 3 km downstream on the Pacific coastal plain, where the river moves more slowly and the incidence of the disease is low.

Author Notes

International Center for Medical Research and Training, Tulane University-Universidad del Valle, Cali, Colombia.

Staff member, The Rockefeller Foundation.

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