Bug Off: Why Some People Are More Attractive to Mosquitoes
Baylor biologist says odor is a major factor in mosquito attraction, offers the Four D’s to minimize potential bites
Credit: chaoss / Collection: iStock / Getty Images Plus
Contact: Shelby Cefaratti-Bertin, 254-327-8012
Follow us: @BaylorUMedia on X and LinkedIn
Summer means mosquitoes, and with more of the pesky insects buzzing around, more people are grappling with mosquito bites and their consequences, ranging from an itchy inconvenience to serious health risks from vector-borne diseases. If it seems like mosquitoes bite you more than others, you may be right, according to Baylor University mosquito expert Jason Pitts, Ph.D. It simply may come down to how you smell.
An associate professor of biology and director of Baylor’s Biology of Global Health 4+1 Program, Pitts focuses his research on mosquitoes and their complex odor-receptors, or sense of smell, to better understand how they locate food sources crucial to survival and reproduction. His impactful work is helping develop new mosquito control methods, which ultimately could lead to a decrease in vector-borne disease transmission around the world.
“Many insects find their way around the world through their sense of smell, even more than vision,” Pitts said. “Mosquitoes and other insects really are adept at finding places to lay their eggs, finding flowers on which to feed or finding people on which to blood feed just by the sense of smell.”
A mosquito’s strong sense of smell is critical to its survival. While all mosquitoes feed from nectar, only females bite humans and other mammals. They need the blood to support egg development in reproduction, and they rely heavily on scent to locate a host, Pitts said.
“As we sweat, we emit volatile odors – or strong smells – which can be very attractive to mosquitoes,” Pitts said, adding that these odors include carboxylic acids, a key component in human sweat, which vary from person to person and can determine how appealing someone is to mosquitoes.
Mosquitoes detect these chemicals in a similar way to how humans process smells. Humans have nerves in their nasal passages that, if tuned, will send signal receptors to the brain – the same process for mosquitoes, guiding them toward a potential meal, Pitts said.
Because of their efficiency in locating human hosts, mosquitoes are considered to be the deadliest creatures in the world, responsible for more than 700,000 deaths each year from vector-borne diseases they transmit, including yellow fever, Zika, dengue, malaria and West Nile virus.
Four D’s of mosquito prevention
Whether you are a favorite meal among mosquitoes or not, Pitts recommends following the “Four D’s” of preventing mosquito breeding and bites – Dress, Drain, DEET and Dusk/Dawn.
Dress
Mosquitoes are attracted to darker colors, so wear light-colored, loose-fitting, long-sleeved shirts and long pants to protect yourself from potential bites.
- Drain
The most important thing anyone can do is to reduce breeding sources for mosquitoes by draining stagnant water. If you have standing water in any kind of container in your yard, get in the habit of emptying those containers, including children’s swimming pools, which should be emptied at least once a week. Defend with DEET
The most effective repellent is EPA-approved DEET (N-Diethyl-meta-toluamide). “Once a mosquito lands on the skin, they taste the skin to decide whether this is a good host or not,” Pitts said. “They can actually taste DEET, which is a long-range repellent. They can smell it and avoid it. When they taste it, they will also fly away.”
Dusk / Dawn
Mosquitoes are more active at dusk and at dawn, when the sun is rising or setting. Avoiding these times will help you avoid bites. If you like to take a morning run or walk at dusk, make sure to apply DEET repellent and wear light-colored clothing.
ABOUT BAYLOR UNIVERSITY
Baylor University is a private Christian University and a nationally ranked Research 1 institution. The University provides a vibrant campus community for 20,000 students by blending interdisciplinary research with an international reputation for educational excellence and a faculty commitment to teaching and scholarship. Chartered in 1845 by the Republic of Texas through the efforts of Baptist pioneers, Baylor is the oldest continually operating University in Texas. Located in Waco, Baylor welcomes students from all 50 states and more than 100 countries to study a broad range of degrees among its 12 nationally recognized academic divisions. Learn more about Baylor University at www.baylor.edu.
ABOUT THE COLLEGE OF ARTS & SCIENCES AT BAYLOR UNIVERSITY
The College of Arts & Sciences is Baylor University’s largest academic division, consisting of 25 academic departments in the sciences, humanities, fine arts and social sciences, as well as 11 academic centers and institutes. The more than 5,000 courses taught in the College span topics from art and theatre to religion, philosophy, sociology and the natural sciences. The College’s undergraduate Unified Core Curriculum, which routinely receives top grades in national assessments, emphasizes a liberal education characterized by critical thinking, communication, civic engagement and Christian commitment. Arts & Sciences faculty conduct research around the world, and research on the undergraduate and graduate level is prevalent throughout all disciplines. Visit the College of Arts & Sciences website.