Table 2.
The entomological estimation of malaria transmission intensity attributable to Anopheles farauti on Ndendo Island, Temotu Province, Solomon Islands during 2008 and 2010.
| Entomological parameters | Pre-intervention | Post-intervention | |||
|---|---|---|---|---|---|
| Lata Nov 2008 | Pala Nov 2008 | Pala Apr 2010 | Pala June 2010 | Pala Dec 2010 | |
| Sporozoite rate (S) (n = number assayed) | 0.0026 (n = 1,150) | 0.0000 (n = 2,561) | 0.0013 (n = 749) | 0.0015 (n = 1,308) | 0.0008 (n = 1,292) |
| Biting rate (B; b/p/n) | NI | ||||
| Indoor | 8.56 | 68.54 | 10.13 | 44.50 | |
| Outdoor | 30.42 | 88.47 | 35.13 | 80.08 | |
| Overall | 19.5 | 78.5 | 22.63 | 62.29 | |
| Entomological inoculation rate (EIR; ib/p/y) | 18.25 | <0.001 | 10.74 | NI | 17.59 |
| Endophagy (Proportion indoors ± se) | 0.221 ± 0.012 (n = 1,172) | 0.432 ± 0.010 (n = 2,355) | 0.223 ± 0.016 (n = 679) | NI | 0.357 ± 0.012 (n = 1,495) |
| Nocturnal biting (Proportion 9 pm-4 am ± se) | 0.503 ± 0.014 (n = 1,172) | 0.523 ± 0.014 (n = 2,355) | 0.546 ± 0.019 (n = 679) | NI | 0.378 ± 0.012 (n = 1,495) |
| Proportion of indoor contact (πi) | 0.368 ± 0.120 | 0.570 ± 0.059 | 0.367 ± 0.108 | NI | 0.404 ± 0.063 |
Where, S = no. of sporozoite positive mosquitoes/no. of mosquitoes tested; B = no. of mosquitoes collected/no. of nights/no. of collectors; and EIR = S × Boverall × 365.
Endophagy is the proportion of mosquitoes caught indoors; nocturnal biting is the proportion of mosquitoes caught during hours when most people are asleep; and the proportion of indoor contact is the indoor and outdoor biting rates weighted throughout the night by the proportion of humans that are typically indoors or outdoors at each time period - see Methods for details. NI = data not included as HLC made from 6-10 pm.