Table 5.
Percentage of blood-feeding Anopheles gambiae collected in IRS and LLIN arms by pyrethrum spray catch and in exit windows traps before and after interventions, Benin*
| Location | Before intervention (May–July 2008) | After intervention (May–July 2009) | Comparison of blood feeding rate before and after intervention | ||||||
|---|---|---|---|---|---|---|---|---|---|
| Total | No. fed | Blood-feeding rate, % | Total | No. fed | Blood-feeding rate, % | ||||
| Mean | 95% CI | Mean | 95% CI | ||||||
| Adjohoun | |||||||||
| IRS arm | 84 | 44 | 52.38 | 50.37–53.63 | 32 | 11 | 34.3 | 4.10–64.40 | P < 0.05 |
| LLIN arm | 91 | 61 | 66.7 | 61.90–71.44 | 72 | 20 | 33.3 | 19.79–46.88 | P < 0.05 |
| Dangbo | |||||||||
| IRS arm | 84 | 46 | 54.3 | 50.37–58.30 | 48 | 8 | 16.5 | –34.82 to 66.82 | P < 0.05 |
| LLIN arm | 82 | 57 | 70.2 | 62.05–78.28 | 100 | 22 | 22 | 18.35–25.30 | P < 0.05 |
| Misserete 1 | |||||||||
| IRS arm | 84 | 43 | 50.7 | 44.86–56.48 | 5 | 2 | 41.5 | –66.50 to 149.50 | P < 0.05 |
| Misserete 2 | |||||||||
| LLIN arm | 288 | 180 | 62.2 | 58.11–66.23 | 4 | 2 | 50 | 50.00–50.00 | P < 0.05 |
| Seme | |||||||||
| IRS arm | 388 | 213 | 54.3 | 43.74–64.93 | 0 | 0 | |||
| LLIN arm | 90 | 52 | 58.3 | 49.19–67.47 | 216 | 152 | 72.3 | 57.13–87.54 | P < 0.05 |
| Akron control | |||||||||
| IRS control | 88 | 52 | 61.7 | 49.86–73.48 | 132 | 80 | 60 | 50.20–69.80 | P > 0.05 |
| LLIN control | 404 | 264 | 64.3 | 56.69–71.98 | 384 | 200 | 54.7 | 43.87–65.46 | P > 0.05 |
*
IRS = indoor residual spraying; LLIN = long-lasting insecticide-impregnated net (Permanet 2.0, Vestergaard Frandsen, Lausanne, Switzerland); CI = confidence interval.