288
■Bio-mathematics, Statistics and Nano-Technologies: Mosquito Control Strategies
Table 18.1: Total number of eggs of Ae. aegypti, number of positive OVTs, POI and DEI
in the study period.
Month
No OVT analyzed
No OVT positive
No eggs
IPO (%)
DEI
August
123
109
14079
88,62
129,17
September
127
111
13937
87,40
125,56
October
127
120
17621
94,53
145,69
Total
377
340
45643
90
134
Data analysis and calculation of rates of infestation and abundance of Ae. aegypti:
Data obtained from the simulated field study Microsoft Excel software was used for data
processing obtained from the simulated field study was processing using Microsoft Excel.
SPSS version 21 was used for descriptive and comparative statistical analysis of the data.
A Kruskal-Wallis test was used to compare the attractiveness of the different substances
tested in the experiment, and to determine the degree of significance of the differences
observed in the egg collections carried out in each point. A chi-square test was conducted
to verify the existence of an association between the substances tested in the OVTs and
the presence of larvae. Two different indices to estimate the vector population density and
its distribution were applied: The positive ovitrap index (POI), which is the proportion of
ovitraps positive for the presence of Aedes eggs, and the density eggs index (DEI), the
average number of eggs per positive ovitrap.
18.3.3
Results
During the three months of monitoring the OVTs, 45643 eggs of Ae. aegypti were col-
lected. The POI was 90% and the DEI was 134. Analysing the distribution and abundance
of the vector, October was the month with the highest indicators (18.1). From the individ-
ual analysis of each of the eight locations, the presence of Ae. aegypti eggs was observed
in all collections carried out, with differences in the amount of eggs collected in different
locations, not following a distribution pattern over the period of this experiment (18.2).
Table 18.2: Total number of Ae. aegypti eggs, number of positive OVTs, POI and DEI, by
locations.
Locations
No OVT analyzed
No OVT positive
No eggs
IPO (%)
DEI
1
47
46
6512
97,87
141,57
2
46
42
7912
91,30
188,38
3
48
46
6288
95,83
136,70
4
45
33
2418
73,33
73,27
5
48
46
5766
95,83
125,35
6
47
41
4087
87,23
99,68
7
48
41
4691
85,42
114,41
8
48
45
7969
93,75
177,09
Total
377
340
45643
90
134