Table 2 Human biting rate (HBR), sporozoite index (SI %), entomological inoculation rate (EIR) and parous rate in Anopheles gambiae in communes under IRS and control commune according to the period of residual effect of Pirimiphos methyl (PM) on treated walls
Periods | Indicators | Districts under IRS (Alibori, Donga) | Control district (Bembereke, Kouande) | P-value |
|---|---|---|---|---|
Period of residual effet of Actellic CS (June–Sep 2017) | HBR/night | 7.56 | 10.81 | < 0.0001 |
SI (%) | 0.999 (19/1902) | 4.18 (55/1316) | < 0.0001 | |
EIR/month | 2.266 | 13.551 | < 0.0001 | |
Parity rate (%) | 36.62 (364/994) | 57.24 (257/449) | < 0.0001 | |
After residual effet of Actellic CS (Oct–Dec 2017) | HBR/night | 2.77 | 3.2 | 0.043 |
SI (%) | 2.92 (18/616) | 6.42 (21/327) | 0.016 | |
EIR/month | 2.424 | 6.161 | < 0.0001 | |
Parity rate (%) | 49.33 (148/300) | 58.16 (114/196) | 0.066 | |
Before IRS 2018 (Jan–Mar 2018) | HBR/night | 1 | 1.45 | 0.002 |
SI (%) | 2.72 (9/331) | 3.95 (9/228) | 0.572 | |
EIR/month | 0.816 | 1.717 | < 0.05 | |
Parity rate (%) | 76.97 (117/152) | 71.70 (76/106) | 0.415 | |
Period of residual effet of Actellic CS (June–Aug 2018) | HBR/night | 7.76 | 11.01 | < 0.0001 |
SI (%) | 0.81 (11/1358) | 2.6087 (27/1035) | 0.0008 | |
EIR/month | 1.885 | 8.618 | < 0.0001 | |
Parity rate (%) | 48.36 (353/730) | 62.96 (289/459) | 0.000117 |