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<h2 class="element-invisible">You are here</h2><div class="breadcrumb"><a href="/">Home</a> » <a href="/news-events">News & Events</a> » <a href="/news-events/nih-research-matters">NIH Research Matters</a></div> <div class="l-region l-region--section-header">
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<p class="publishdate"><span property="dc:date" datatype="xsd:dateTime" content="2013-12-16T00:00:00-05:00" class="date-display-single">December 16, 2013</span></p><div class='syndicate'><h1>How Mosquitoes Detect People</h1><div class="media-float-right"><div class="ds-1col file file-image file-image-jpeg view-mode-floated_media clearfix">
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<!--[if IE 9]><video style="display: none;"><![endif]-->
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-large/public/news-events/research-matters/2013/20131216-mosquito.jpg?itok=z5CfMDB_&timestamp=1431702483 1x" media="screen and (min-width: 960px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2013/20131216-mosquito.jpg?itok=8m-8PT7g&timestamp=1431702483 1x" media="screen and (min-width: 800px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium-small/public/news-events/research-matters/2013/20131216-mosquito.jpg?itok=Itqa11jI&timestamp=1431702483 1x" media="screen and (min-width: 600px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-small/public/news-events/research-matters/2013/20131216-mosquito.jpg?itok=__-ky59Q&timestamp=1431702483 1x" media="screen and (min-width: 480px)" />
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<source srcset="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-tiny/public/news-events/research-matters/2013/20131216-mosquito.jpg?itok=9FfWdJor&timestamp=1431702483 1x" media="screen and (min-width: 0)" />
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<img src="https://www.nih.gov/sites/default/files/styles/floated_media_breakpoint-medium/public/news-events/research-matters/2013/20131216-mosquito.jpg?itok=8m-8PT7g&timestamp=1431702483" alt="mosquito." title="mosquito" />
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</picture><span class="caption">Female Aedes aegypti mosquito seeking out a penetrable site on the skin of its host.</span><span class="credit">James Gathany, CDC</span></div>
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</div><p>Researchers discovered a receptor that mosquitoes use to detect both carbon dioxide and skin odor, and they identified compounds that interact with the receptor. The findings may help guide strategies to control mosquitoes and the diseases they transmit.</p>
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<p>Mosquitoes have an amazing ability to zero in on us from afar and head straight for our bare skin. Unfortunately, mosquitoes are much more than an itchy annoyance. They transmit several serious diseases including malaria, one of the most common infectious diseases in the world. Nearly 1 million people die of malaria every year. Mosquitoes also transmit Dengue viruses and filarial worms.</p>
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<p>Female mosquitoes have nerve cells called cpA neurons that have a receptor to detect carbon dioxide. This enables them to sense the plumes of air we exhale. But mosquitoes are still attracted to human skin even in the absence of carbon dioxide. A team of researchers led by Dr. Anandasankar Ray at University of California, Riverside, set out to determine the neurons and receptors required for attraction to skin odor. Their research was supported in part by NIH’s National Institute of Allergy and Infectious Diseases (NIAID). Results appeared online on December 5, 2013, in <em>Cell</em>.</p>
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<p>Brief exposure to a chemical that shut down the mosquitoes’ carbon dioxide receptor rendered them unable to react to carbon dioxide from exhaled breath. The scientists tested the response of these mosquitoes to skin odorants by placing them in a wind tunnel with a plate of glass beads that had been worn in socks for several hours to give them the scent of human foot odor. Both <em>Aedes aegypti</em> and <em>Anopheles gambiae</em> mosquitoes — which transmit dengue and malaria respectively — were much less attracted to the scented beads after being exposed to the chemical. These results showed that the receptor responsible for detecting carbon dioxide also detects skin odorants.</p>
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<p>Chemicals previously known to block mosquitoes’ carbon dioxide receptor can’t be used around people because of unpleasant odors and health safety concerns. To identify more suitable compounds, the team developed a computer simulation method to screen almost half a million chemical compounds in search of structures that might interact with the receptor. They identified 138 compounds that were pleasant smelling, inexpensive, and considered safe for human use.</p>
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<p>The researchers focused on 2 of the compounds recognized as safe for humans. Ethyl pyruvate, which has a fruity smell and is approved as a flavor agent in food, blocked attraction of mosquitoes to a human hand. Conversely, cyclopentanone, which is minty-smelling and is approved as a flavor and fragrance agent, attracted mosquitoes to a baited trap as effectively as carbon dioxide.</p>
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<p>“Odors that block this dual-receptor for carbon dioxide and skin odor can be used as a way to mask us from mosquitoes. On the other hand, odors that can act as attractants can be used to lure mosquitoes away from us into traps. These potentially affordable ‘mask’ and ‘pull’ strategies could be used in a complementary manner, offering an ideal solution and much needed relief to people in Africa, Asia, and South America — indeed wherever mosquito-borne diseases are endemic,” Ray says.</p>
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<p>— by Carol Torgan, Ph.D.</p>
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</div><h2 class="label-above">Related Links</h2><ul class="spaced print-urls"><li><a href="https://www.youtube.com/watch?v=7wijX9WZUpc" target="_top">Targeting the Mosquito's Sense of Smell (video)</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/malaria-vaccine-found-safe-protective" target="_top">Malaria Vaccine Found Safe and Protective</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/infection-makes-mosquitoes-immune-malaria-parasites" target="_top">Infection Makes Mosquitoes Immune to Malaria Parasites</a></li><li><a href="https://www.nih.gov/news-events/nih-research-matters/cell-phones-track-malarias-spread" target="_top">Cell Phones Track Malaria’s Spread</a></li><li><a href="http://www.niaid.nih.gov/topics/Malaria" target="_top">Malaria</a></li><li><a href="https://publications.nigms.nih.gov/insidelifescience/vector-borne-diseases.html" target="_top">Taking the 'Bite' Out of Vector-Borne Diseases</a></li></ul><p class="footnote"><strong class="label-inline">References: </strong><a href="http://www.ncbi.nlm.nih.gov/pubmed/24315103">Targeting a Dual Detector of Skin and CO2 to Modify Mosquito Host Seeking</a>. Tauxe GM, Macwilliam D, Boyle SM, Guda T, Ray A. <em>Cell.</em> 2013 Dec 5;155(6):1365-79. doi: 10.1016/j.cell.2013.11.013. PMID: 24315103.</p><p class="footnote"><strong class="label-inline">Funding: </strong>NIH’s National Institute of Allergy and Infectious Diseases (NIAID), National Science Foundation, University of California Global Health Institute, and the Bill and Melinda Gates Foundation.</p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/research-context-detecting-cancer">Research in Context: Detecting cancer</a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/risk-future-burden-dementia-united-states">Risk and future burden of dementia in the United States </a></p>
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<p><a href="https://www.nih.gov/news-events/nih-research-matters/complete-wiring-map-adult-fruit-fly-brain">Complete wiring map of an adult fruit fly brain</a></p>
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<h3 class="block__title">About NIH Research Matters</h3>
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<p><strong>Editor:</strong> Harrison Wein, Ph.D.</p>
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<p><strong>Assistant Editors:</strong> Vicki Contie and Brian Doctrow, Ph.D.</p>
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<p><strong><em>NIH Research Matters </em></strong>is a weekly update of NIH research highlights reviewed by NIH’s experts. It's published by the <a href="/institutes-nih/nih-office-director/office-communications-public-liaison">Office of Communications and Public Liaison</a> in the <a href="/institutes-nih/nih-office-director">NIH Office of the Director</a>.</p>
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<p>ISSN 2375-9593</p>
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