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Mosquitoes in an olfactometer. Entomologist demonstrating the attractiveness of his hand to yellowfever mosquitoes (Aedes aegypti) using an olfactometer, which has a screen to separate the attractant (in this case, his hand) from the insects. Humans give off many scents that attract mosquitoes. By identifying the most attractive scents, scientists could create effective traps or repellants. This research was carried out at the US Agricultural Research Service Center for Medical, Agricultural, and Veterinary Entomology's Mosquito and Fly Research Unit in Gainesville, Florida.
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