Table 1. Deltamethrin resistance levels.
| Population | Origin | Type | Resistance | RR50 a | KDT50 b |
|---|---|---|---|---|---|
| LivpS | Benin | Lab strain | susceptible | 1 | 11.5 |
| BoraS | French Polynesia (Bora-Bora) | Lab strain | susceptible | 1 | 12.1 |
| DeltaR | French Polynesia (Bora-Bora) | Lab strain | slightly resistant | ~5 | 14.2 |
| PhetR | Thailand (Phetchaburi) | Field | resistant | ~250 | 98.2 |
| NakhRc | Thailand (Nakonsawan) | Field | resistant | ~250 | 92.9 |
| NwOrS | USA (New Orleans) | Lab strain | susceptible | 1 | 11.9 |
| CaynR | French Guiana, Cayenne) | Field | highly resistant | ~750 | >500 |
| StGeR | French Guiana, St-Georges) | Field | highly resistant | ~750 | >500 |
a: Resistance ratios (RR50) were estimated based on the dose of insecticide used for paper impregnation leading to 50% mortality (±10%) after 1h exposure.
b: KDT50: Time (min) necessary to knock down 50% of individuals using papers impregnated with 0.05 g/100 mL deltamethrin following WHO insecticide testing recommendations.
C: population showing significant cross-resistance to organophosphates. Data extracted from [28].