Biological larviciding against malaria vector mosquitoes with Bacillus thuringiensis israelensis (Bti) – Long term observations and assessment of repeatability during an additional intervention year of a large-scale field trial in rural Burkina Faso

Figures & data

Figure 1. Average numbers of female Anopheles mosquitoes per trap per night captured indoors during successive sampling rounds of the three study years. The colors correspond to the average values in geographical areas receiving different Bti treatments in 2014 and 2015 (2013 was the baseline year). The vertical dotted lines indicate the common sampling period over the 3 years. Trm = treatment.

Figure 2. Difference-in-difference estimates during the common sampling period obtained with a Poisson regression model comparing the intervention years with the baseline year and indicating the reduction in the count of indoor female Anopheles mosquitoes per night per trap achieved through guided or full Bti treatment. The reference line represents the rate ratio value of 1 under the null hypothesis. (p-values were <0.001 for all entries).