Table 2

Data leading to estimates of entomological inoculation rates in highlands and lowlands with and without treated nets

HIGHLAND




LOWLAND




Hamlet:-
 Ml, M2, M3, M6, M8, M9
 M4, M5, M7, M10 M11
 B1, B3, B5, B6, B8
 B2, B4, B7, B9, B10

Geom
Mean
 %
Af
 %
Am
 Geom
Mean
 %
Af
 %
Am
 Geom
Mean
 %
Af
 %
Am
 Geom
Mean
 %
Af
 %
Am
Oct-Dec'98
 1.65a
 60
 20
 1.60a
 43
 45
 10.40b
 62
 6
 13.0b
 36
 4
Jan-Mar'99
 1.57a
 59
 10
 1.26a
 45
 16
 31.47b
 7
 0
 31.59b
 4
 0
Apr-Jun'99
 3.65a
 30
 6
 3.96a
 35
 7
 47.70b
 11
 1
 67.49b
 8
 0
Jul-Aug'99
 1.27a
 63
 22
 0.67a
 38
 35
 6.09b
 55
 11
 7.52b
 39
 2
Total on 4
trap nights
 8.14

7.49

95.66

119.60

Bites/pers/yearj
 1114

1025

13093

16370

%CSP +ve (no. tested) [15]
 3.66% (709)

3.97% (478)

4.33% (2681)

4.49% (1381)

EIR/year
 40.1

37.4

566.9

735.0


NO NETS
 NETS IN
 NO NETS
 NETS IN
Oct-Dec'99
 0.95a
 50
 29
 0.26b
s;f [0.11 0.34]
 18
 79
 1.12a
 55
 19
 0.31b
s;f [0.35 0.28]
 60
 13
Jan-Mar'00
 0.52a
 75
 4
 0.10b
s;f [0; 0.12]
 20
 40
 1.53C
 26
 0
 0.40a
s;f [0.50 0.35]
 11
 0
Apr-Jun'00
 1.19a
 49
 8
 0.28b
s;f [0.34 0.24]
 33
 37
 11.76c
 19
 1
 7.29c
s;f [5.52 8.76]
 12
 0
Jul-Aug'00
 0.31a
 44
 28
 0.21a
s;f [0.17 0.24]
 27
 27
 9.99b
 68
 3
 2.04c
s;f [1.59 2.51]
 58
 0
Total on 4
trap nights
 2.06

0.85

24.40

10.04

Bites/pers./yearj
 282

116

3339

1374

%CSP +ve (no. tested) [16]
 3.68% (380)a

2.74% (73)a

4.45% (629)a

2.73% (916)a
s:f [2.4; 3.0%]

EIR/year
10.4

3.2

148.6

37.5

Reduction in EIR
 69.2%
 74.8%

Geometric means of light trap catches in rooms with untreated nets in highland and lowland villages in the four seasons of the years before and after introduction of alphacypermethrin treated nets into half of the villages. From these data and data on sporozoite (CSP) rates determined by ELISA, entomological inoculation rates per person per year are calculated. Means in the same row with the same superscript do not differ significantly (t test, Kruskall Wallis or χ2); jcalculated from mean catch on 4 nights multiplied by 365/4 × 1.5 [8]; the species composition of the anopheline vector population is indicated in terms of the percentage that were An. funestus (Af) and An. marshallii s.l. (Am): the remainder were An. gambiae s.l. [Data in square brackets marked by s;f indicate light trap catches and CSP rates in villages with nets treated respectively with the SC or the Fastac (granular) formulations of alphacypermethrin]

Maxwell et al. Malaria Journal 2003 2:28   doi:10.1186/1475-2875-2-28