Originally posted on August 15, 2022
- Global News, August 18, 2022: Health Matters: How mosquitoes smell their human targets
- CHED 630 Edmonton & CHQR 770 Calgary Radio Interviews
- The Jill Bennett Show, August 15, 2022 (25:18 mark): How to avoid becoming a mosquito’s dinner!
- Vancouver is Awesome, August 15, 2022: 5 tips to avoid being bitten by mosquitoes according to a Vancouver insect expert
- UBC News, August 15, 2022: How to avoid becoming a mosquito’s dinner
Zhilei Zhao, Jessica L. Zung, Annika Hinze, Alexis L. Kriete, Azwad Iqbal, Meg A. Younger, Benjamin J. Matthews, Dorit Merhof, Stephan Thiberge, Rickard Ignell, Martin Strauch & Carolyn S. McBride. 2022. Mosquito brains encode unique features of human odour to drive host seeking. Nature volume 605, pages 706–712 (2022
A globally invasive form of the mosquito Aedes aegypti specializes in biting humans, making it an efficient disease vector1. Host-seeking female mosquitoes strongly prefer human odour over the odour of animals2,3, but exactly how they distinguish between the two is not known. Vertebrate odours are complex blends of volatile chemicals with many shared components4,5,6,7, making discrimination an interesting sensory coding challenge. Here we show that human and animal odours evoke activity in distinct combinations of olfactory glomeruli within the Ae. aegypti antennal lobe. One glomerulus in particular is strongly activated by human odour but responds weakly, or not at all, to animal odour. This human-sensitive glomerulus is selectively tuned to the long-chain aldehydes decanal and undecanal, which we show are consistently enriched in human odour and which probably originate from unique human skin lipids. Using synthetic blends, we further demonstrate that signalling in the human-sensitive glomerulus significantly enhances long-range host-seeking behaviour in a wind tunnel, recapitulating preference for human over animal odours. Our research suggests that animal brains may distil complex odour stimuli of innate biological relevance into simple neural codes and reveals targets for the design of next-generation mosquito-control strategies.