Differential response to plant- and human-derived odorants in field surveillance of the dengue vector, Aedes aegypti.

Differential response to plant- and human-derived odorants in field surveillance of the dengue vector, Aedes aegypti. Acta Trop. 2019 Sep 05;:105163 Authors: Omondi WP, Owino EA, Odongo D, Mwangangi JM, Torto B, Tchouassi DP Abstract Linalool oxide (LO) and hexanoic acid (HA) represent plant- and human-derived odorants, respectively, previously found as attractants for the dengue vector Aedes aegypti. Here, we investigated if a blend of both compounds can improve captures of this mosquito species in field trials in two dengue endemic sites, Kilifi and Busia Counties in Kenya. Ae. aegypti captures were significantly higher in Kilifi than Busia (χ21,142=170.63, P<0.0001) and varied by treatments (χ25,137=151.19, P= 0.002). We found that CO2-baited BG Sentinel traps combined with a blend of both odorants decreased Ae. aegypti captures about 2 to 4-fold compared to captures with the individual compounds (LO or HA) used as positive controls. This was the case for all blends of LO and HA, irrespective of the doses tested. Our findings indicate that combining plant- and human-derived odors may elicit a masking effect in trapping Ae. aegypti. These results partly corroborate previous findings for malaria mosquitoes which showed that combining lures from both host sources either decreases or increases trap catches depending on the dose. Further investigations in the usefulness of combining plant and animal odorants in mosquito trapping i...
Source: Acta Tropica - Category: Infectious Diseases Authors: Tags: Acta Trop Source Type: research