Long-term exposure of Aedes aegypti to Bacillus thuringiensis svar. israelensis did not involve altered susceptibility to this microbial larvicide or to other control agents

Table 3 Activity of diflubenzuron to Bti-selected Ae. aegypti larvae

Sample^a	No. of larvae	EIC₅₀ (95% CI)^b	RR^c	EIC₉₀ (95% CI)^b	RR^c
Rocke	1680	0.774 (0.662–0.903)	1.0	1.422 (1.226–1.940)	1.0
RecBti F₃₀	1680	1.188 (1.050–1.320)	1.5	2.123 (1.911–2.416)	1.5

^aRockefeller (Rocke) reference strain and the RecBti selected strain (generation F₃₀)
^bEmergence inhibitory concentrations (μg/l) for 50% and 90% of adults from third-instar larvae exposed for 30 days (mean and 95% confidence intervals, CI)
^cResistance ratio between the EIC for the test strain and that for the reference strain

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