Fig. 3. CA inhibitors decrease the pH inside the posterior midgut in adult Ae. aegypti females. (A) Cresol Red added to mosquitoes treated with 10^–4 mol l^–1 MTZ revealed a decrease in pH (left) when compared to those not treated (right). (B) Thymol Blue added to mosquitoes treated with 10^–4 mol l^–1 MTZ revealed a decrease in pH (left) when compared to those not treated (right). However the effect was not as evident as observed with Cresol Red. Results shown are representative of 10 treated and 10 untreated mosquitoes from 2–4 independent experiments.