| 11. | He's braved heat, cold, tsetse flies, and more.
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| 12. | African Trypanosomiasis disease is spread by the bite of an infected tsetse fly.
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| 13. | But some scientists doubt the tsetse initiative can work.
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| 14. | Tsetse pupae are under 1.0 cm long.
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| 15. | At the end of the pupal stage, tsetse emerge as adult flies.
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| 16. | Other forms of human trypanosomiasis also exist but are not transmitted by tsetse.
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| 17. | Young was also particularly interested in tsetse fly research.
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| 18. | Researchers also knew that trypanosomes were transmitted by a species of tsetse fly.
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| 19. | However, at the time, he had no idea they were tsetse flies.
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| 20. | In the African jungle, mosquitoes bring malaria and tsetse flies bring sleeping sickness.
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