Differences in skin microorganisms may help explain why mosquitoes are more attracted to some people than others. A Nature Communications study published October 19 combined human skin microbiome profiling, chemical analysis and animal experiments to investigate whether particular bacteria can alter mosquito-seeking behaviour.
The human component included 37 volunteers classified by relative mosquito attractiveness. Bacillus species were associated with lower attraction. Researchers then applied Bacillus licheniformis and Bacillus paralicheniformis to the skin of three cynomolgus monkeys and observed reduced attraction by Aedes aegypti mosquitoes in the experimental model. Chemical profiling suggested that the intervention altered volatile compounds released from the skin.
Among the compounds examined were decanoic acid and p-cresol, both linked to changes in mosquito responses under the tested conditions. These observations support a biologically plausible route from microbial community composition to skin odour and insect behaviour. They do not establish that placing those bacteria on human skin would safely prevent mosquito bites or vector-borne disease.
The paper itself notes important limitations. Its sequencing approach involved amplification that could distort the apparent relative abundance of skin bacteria. The primate intervention used a very small number of animals, and the researchers did not demonstrate the same protective effect in a controlled human application study. They also did not validate the approach across all major mosquito genera responsible for malaria and other infections.
The public-health value of the research is therefore exploratory. It identifies possible molecular leads for future repellent development and suggests that skin ecology should be considered alongside host genetics and environmental conditions. Established mosquito-control methods remain the appropriate practical reference point until products derived from these findings undergo safety, effectiveness and regulatory assessment.