Skip to main content

Table 5 Entomological parameters of malaria transmission recorded for vector species from all district

From: A reduction in malaria transmission intensity in Northern Ghana after 7 years of indoor residual spraying

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
  1. No ovary dissections done in 2009 and 2010
  2. Rainfall data obtained from Ghana Meteorological Services Dept. weather stations in Savelugu and Tamale and Savannah Agricultural Research Institute—Tolon Kumbungu
  3. PY pyrethroids (alphacypermethrin: 2009, 2011 and 2012; deltamethrin 2010); OP organophosphate (pirimiphos methyl)