Brazilian ecologist who migrated to the US in 1976 discovered why mosquitoes love human blood

Mosquito attraction to human study: Walter Leal discovered nonanal, a compound humans and birds produce. This natural chemical proves irresistible to Culex mosquitoes, explaining their attraction. Leal tested this compound on his own skin to confirm its effectiveness. His extensive research also explains why mosquitoes avoid DEET repellent.

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