Background
Worldwide, mosquito vectors are transmitting several etiological agents of important human diseases, including malaria, causing millions of death every year. In Saudi Arabia as elsewhere, vector-control is based mostly on chemical insecticides which may be toxic and cause environmental deprivation. Here, to support the development of bio-pesticide alternatives, a study was conducted to identify native Bacillus thuringiensis (Bt) isolates with improved toxicity against the malaria vector, Anopheles gambiae.