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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

From: Lessons learned, challenges and outlooks for decision-making after a decade of experience monitoring the impact of indoor residual spraying in Benin, West Africa

PeriodsIndicatorsDistricts under IRS (Alibori, Donga)Control district (Bembereke, Kouande)P-value
Period of residual effet of Actellic CS (June–Sep 2017)HBR/night7.5610.81< 0.0001
SI (%)0.999 (19/1902)4.18 (55/1316) < 0.0001
EIR/month2.26613.551< 0.0001
Parity rate (%)36.62 (364/994)57.24 (257/449)< 0.0001
After residual effet of Actellic CS (Oct–Dec 2017)HBR/night2.773.20.043
SI (%)2.92 (18/616)6.42 (21/327)0.016
EIR/month2.4246.161< 0.0001
Parity rate (%)49.33 (148/300)58.16 (114/196)0.066
Before IRS 2018 (Jan–Mar 2018)HBR/night11.450.002
SI (%)2.72 (9/331)3.95 (9/228)0.572
EIR/month0.8161.717< 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/night7.7611.01< 0.0001
SI (%)0.81 (11/1358)2.6087 (27/1035) 0.0008
EIR/month1.8858.618< 0.0001
Parity rate (%)48.36 (353/730)62.96 (289/459)0.000117
  1. Period of residual effect of pirimiphos methyl: when the mortality of An. gambiae Kisumu is ≥ 80% after exposure to tread walls