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to detect chemicals found in perspiration. In Aedes, the search for a host takes place in two phases. First, the mosquito flies about until it detects a host's odorants; then it flies towards them, using the concentration of odorants as its guide. Mosquitoes prefer to feed on people with type O blood, an abundance of skin bacteria, and high body heat; they also favor pregnant women. Individuals' attractiveness to mosquitoes has a heritable, genetically controlled component.

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