Table 5.
Entomological parameters of malaria transmission recorded for vector species from all district
| District and transmission indicators | 2009 | 2010 | 2011 | 2012 | 2013 | 2014 |
|---|---|---|---|---|---|---|
| Savelugu Nanton District (SND) | ||||||
| Insecticide sprayed | PY | PY | PY | OP | OP | OP |
| Parity rate (# dissected) | – | – | 44.8% (806) | 37.4% (457) | 27.5% (469) | 28.1% (285) |
| Sporozoite rates (# examined) | 0.4% (550) | 0.2% (882) | 0.4% (794) | 1.9% (530) | 0.0% (841) | 0.0% (400) |
| ∑ Monthly EIRs post-IRS season (July–December) | 2.1 | 6.9 | 6.3 | 3.5 | 0.0 | 0.0 |
| Tolon Kumbungu District (TKD) | ||||||
| Insecticide sprayed | PY | PY | PY | PY | No IRS | No IRS |
| Parity rate (# dissected) | – | – | 53.3% (1140) | 46.6% (1203) | 50.4% (2066) | 68.5% (1089) |
| Sporozoite rates (# examined) | 0.5% (582) | 0.5% (1229) | 0.5% (1453) | 3.6% (1048) | 3.3% (883) | 4.9% (388) |
| ∑ Monthly EIRs post IRS season (July–December) | 13.8 | 21.0 | 24.0 | 41.8 | 137.9 | 154.4 |
| Tamale Metropolis (No IRS) | ||||||
| Insecticide sprayed | No IRS | No IRS | No IRS | No IRS | No IRS | No IRS |
| Parity rate (# dissected) | – | – | 68.6% (1625) | 65.8% (1764) | 64.3% (2687) | 72.3% (2395) |
| Sporozoite rates (# examined) | 1.6% (939) | 2.0% (1764) | 3.2% (1307) | 1.9% (1275) | 3.1% (1140) | 2.2% (1754) |
| ∑ Monthly EIRs post-IRS season (July–December) | 35.0 | 109.4 | 103.1 | 125.6 | 188.0 | 104.7 |
| Mean annual rainfall (mm) | 149.6 | 120.0 | 87.4 | 87.9 | 77.3 | 79.9 |
No ovary dissections done in 2009 and 2010
Rainfall data obtained from Ghana Meteorological Services Dept. weather stations in Savelugu and Tamale and Savannah Agricultural Research Institute—Tolon Kumbungu
PY pyrethroids (alphacypermethrin: 2009, 2011 and 2012; deltamethrin 2010); OP organophosphate (pirimiphos methyl)