Table 4 Presence of insensitive target site acetylcholinesterase (AChE) in Anopheles culicifacies and Anopheles subpictus populations [homozygous sensitive (SS), heterozygous (RS) and homozygous insensitive (RR) are given according to percentage remaining activity of AChE after insecticide inhibition (WHO, 1998)]
An. culicifacies % population | An. subpictus % population | |||||
|---|---|---|---|---|---|---|
SS (< 30%) | RS (30–70%) | RR (> 70%) | SS (< 30%) | RS (30–70%) | RR (> 70%) | |
Anuradhapura | 31 | 42 | 27 | 31 | 53 | 16 |
Kurunegala | 70 | 25 | 5 | 22 | 52 | 26 |
Moneragala | 27 | 49 | 25 | 22 | 52 | 26 |
Puttalam | 54 | 17 | 29 | 40 | 32 | 28 |
Trincomalee | 60 | 13 | 27 | 17 | 13 | 70 |