From CNN:
Hundreds of mosquitoes in the main 20-by-20-meter facility were then treated to a buffet of the sleeping subjects’ scents. Infrared cameras tracked the mosquitoes’ movement to the different samples. (The mosquitoes used in the study were not infected with malaria, and they couldn’t reach the sleeping humans.)
The researchers found what many who have been on a picnic would attest to: Some people attract more mosquitoes than others. What’s more, chemical analyses of air from the tents revealed the odor-causing substances behind the mosquitoes’ attraction, or lack thereof.
The mosquitoes were most attracted to airborne carboxylic acids, including butyric acid, a compound present in “stinky” cheeses such as Limburger. These carboxylic acids are produced by bacteria on human skin and tend not to be noticeable to us.
While carboxylic acids attracted the mosquitoes, the insects seemed to be deterred by another chemical called eucalyptol, which is present in plants. The researchers suspected that one sample with a high eucalyptol concentration might have been related to the diet of one of the participants.
Simulundu said that finding a correlation between the chemicals present in different people’s body odor and the mosquitoes’ attraction to those scents was “very interesting and exciting.”
The CNN report is at https://www.cnn.com/2023/05/19/world/mosquito-human-body-odor-malaria-scn/index.html