Table 1.

Toxicity of Bacillus thuringiensis svar. israelensis (IPS-82) and its protoxins to Bti-selected Ae. aegypti larvae

Samplea	No. of larvae	LC50 (95% CI)b	RRc	LC90 (95% CI)b	RRc
Bti
Rocke	1620	0.008 (0.007–0.009)	1.0	0.026 (0.021–0.036)	1.0
RecBti
F1	1480	0.013 (0.011–0.016)	1.6	0.030 (0.024–0.048)	1.2
F5	1380	0.022 (0.018–0.028)	2.8	0.069 (0.048–0.143)	2.7
F10	1080	0.018 (0.015–0.020)	2.3	0.049 (0.039–0.070)	1.9
F15	1380	0.012 (0.010–0.013)	1.5	0.029 (0.024–0.038)	1.1
F20	1680	0.009 (0.007–0.010)	1.1	0.024 (0.021–0.030)	0.9
F25	1680	0.007 (0.006–0.009)	0.9	0.026 (0.022–0.035)	1.0
F30	1680	0.012 (0.010–0.013)	1.5	0.024 (0.022–0.029)	0.9
Cry11Aa
Rocke	1080	0.162 (0.121–0.210)	1.0	1.506 (0.909–3.525)	1.0
Rocked	1260	0.436 (0.338–0.666)	1.0	2.470 (1.650–8.576)	1.0
RecBti
F2	1600	0.121 (0.099–0.145)	0.7	0.512 (0.396–0.727)	0.3
F5	1440	0.217 (0.183–0.256)	1.3	0.754 (0.571–1.052)	0.5
F10	1440	0.498 (0.369–0.642)	3.1	4.515 (2.717–12.965)	3.0
F15	1260	0.459 (0.365–0.568)	2.8	2.923 (2.020–5.116)	1.9
F20	1260	0.672 (0.540–0.846)	4.1	4.677 (2.965–9.055)	3.1
F25d	1260	0.653 (0.472–0.924)	1.5	nd	nd
F30d	2400	1.662 (1.203–2.400)	3.8	nd	nd
Cry4Ba
Rocke	1080	0.331 (0.209–0.492)	1.0	nd	nd
RecBti
F2	1280	0.694 (0.483–0.978)	2.1	nd	nd
F5	1200	0.402 (0.304–0.508)	1.2	nd	nd
F10	1200	0.707 (0.435–1.265)	2.1	nd	nd
F15	2100	0.570 (0.396–0.806)	1.7	nd	nd
F20	1200	0.424 (0.276–0.610)	1.3	nd	nd
F25	1260	0.701 (0.487–0.989)	2.1	nd	nd
F30	1260	0.882 (0.575–1.426)	2.7	nd	nd

Abbreviation: nd not determined

^aRockefeller (Rocke) reference strain and the RecBti selected strain

^bLethal concentrations (mg/l) for 50% and 90% of third-instar larvae exposed for 24 h (mean and 95% confidence intervals, CI)

^cResistance ratio between the LC for the test strain and that for the reference strain

^dReference used to determine RR for F₂₅ and F₃₀