<i>Anopheles gambiae</i> and <i>An. arabiensis</i> deltamethrin resistance bioassay results.

*Species identification between An. gambiae and An. arabiensis, which was done after the bioassay, revealed the exclusive presence of An. arabiensis in Ahero and Chemilil. For Busia, Bungoma and Emutete, kdr allele frequency refers only to An. gambiae samples. **Percentage of mortality refers to the percentage of mosquitoes that died 24 hrs after recovery from a 60 min exposure to the insecticides. ***Resistance classification is based on WHO criteria: “Resistant” (mortality less than 80%), “Probable Resistant” (mortality rate ranged from 80–97%), and “Susceptible” (mortality more than 98%).