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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)