Table 1. Infectious status of malaria vectors and dominant contribution of Anopheles funestus mosquitoes to ongoing malaria transmission, despite their low abundance relative to Anopheles arabiensis.
| Anopheles arabiensis | Anopheles funestus s.l | |
|---|---|---|
| Total number of mosquitoes collected by CDC Light Trap (January 2015 to January 2016) | 20135 | 4759 |
| Total number of trap nights | 1152 | 1152 |
| Biting rate per night | 17.48 | 4.13 |
| Relative efficiency (CDC-LT) relative to HLC (Derived from Okumu et al 2008 [38]) | 0.3 | 0.68 |
| Corrected biting rate | 58.26 | 6.08 |
| Total number of mosquitoes analysed for Plasmodium falciparum circumsporozoite protein (CSP) | 20135 | 4759 |
| Total number of sporozoite positive mosquitoes | 4 | 25 |
| Sporozoite rate | 0.0002 | 0.0053 |
| Annual EIR (Adjusted)** | 4.22 | 11.65 |
| % EIR Contribution (Adjusted)** | 26.61% | 73.39% |
| Annual EIR (not adjusted) | 1.27 | 7.92 |
| % EIR Contribution (not adjusted) | 13.79% | 86.21% |
• Annual EIR (Corrected biting rate x Sporozoite rate x 365)
• Overall EIR (EIR for An. arabiensis+ EIR for An. funestus) = 18.45
• *86.3% of the mosquitoes from the An. funestus group tested were An. funestus s.s, 8.4% were An. leesoni and 5.2% were An. rivulorum. Of all An. funestus s.l mosquitoes that tested positive for malaria parasites, 96% were An. funestus s.s, the remaining 4% being An. rivulorum.
• **Where the estimates are adjusted, these adjustments were done using coefficients computed as the ratio of mosquito catches by CDC-Light Traps to catches Human Landing Catch methods. These coefficients were 0.3 for An. arabiensis and 0.68 for An. funestus as determined by Okumu et al 2008 [35]