Why Some People Are Mosquito Magnets: Skin Bacteria and Odor Preferences
- Human skin chemistry and volatile organic compounds heavily influence which mosquito species prefer to bite specific individuals.
- Female mosquitoes rely on a sophisticated detection system to find hosts, tracking carbon dioxide, body heat, and distinct chemical signatures.
- A study published in iScience examined how three of the world’s deadliest mosquito species reacted to the body chemistry of more than 100 human volunteers.
Human skin chemistry and volatile organic compounds heavily influence which mosquito species prefer to bite specific individuals. Researchers testing human scent profiles found that three distinct mosquito species preferred different people based on individual skin odor and skin bacteria variations. These findings could reshape how scientists approach vector control by paving the way for new, microbe-based repellents.
Female mosquitoes rely on a sophisticated detection system to find hosts, tracking carbon dioxide, body heat, and distinct chemical signatures. While carbon dioxide acts as a long-range signal drawing insects from dozens of feet away, skin chemistry dictates who gets bitten once the mosquito closes in.
Decoding Human Odor Signatures Across 119 Volunteers
A study published in iScience examined how three of the world’s deadliest mosquito species reacted to the body chemistry of more than 100 human volunteers. Researchers from Florida International University tested these interactions to better understand human odor signatures.
Matthew DeGennaro, a neurogeneticist and director of the Biomolecular Sciences Institute at Florida International University, noted that different mosquito species might have unique preferences rather than sharing a universal attractor.
Distinct Scent Profiles Drive Species-Specific Biting
The experiment involving 119 adult participants showed that the three mosquito species did not agree on which human was most attractive. Instead, each species responded to a distinct scent profile.
Aedes aegypti showed a slight preference for male participants over female participants. At the same time, both Aedes aegypti and Culex quinquefasciatus favored the absence of cyclic alcohols and monoterpenes typically found in perfumes and essential oils. Meanwhile, Aedes albopictus displayed a preference for ketones and plant-like volatile organic compounds secreted by human skin.
The Critical Role of the Skin Microbiome
Skin microbiome composition also plays a crucial role in these interactions. Researchers associated certain bacterial families with attraction in Culex quinquefasciatus and others with aversion.
Matthew DeGennaro stated that skin microbiomes define individual human odor signatures, with each mosquito species finding its own way to decode that signature.
Combating Global Pathogens as Mosquito Ranges Expand
Understanding these precise chemical interactions is vital for public health. Female mosquitoes transmit diseases that cause over one million deaths globally each year.
Aedes aegypti and Aedes albopictus transmit viruses that cause dengue and Zika, while Aedes aegypti can also transmit the yellow fever virus. Additionally, Culex quinquefasciatus transmits West Nile virus, a pathogen that recently saw significant case surges in parts of the United States. Isolating the specific components of human odor that attract or repel these insects could lead to novel strategies to combat vector-borne diseases as shifting climate patterns expand mosquito ranges.