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SC3019: African Black Fly or Simulium damnosum blood feeding on a human host at Daboese, Ghana. The tarsal claws on the first pair of legs are upturned, possibly this helps to avoid alerting the human host to its presence. Human infection by the nematode Onchocerca volvulus is caused by the transmission of the nematode through the intermediate host Simulium damnosum, the resulting human disease is called African River Blindness or Onchocerciasis.

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