Seasonal and Geographical Analysis of Aedes Infestation
Seasonal and geographical analysis of Aedes vectors that infested in different container types was based on the assumption of binomial distribution of the Aedes vectors that infested in two related urban and rural settings of Narathiwat; that is, any larvae of Ae. aegypti or Ae. albopictus, or both were found in any water-holding containers inside or outside the houses between wet and dry seasons. In this study, none or a very small number of the pupae found in all the containers were negligible. When using the container as the unit of analysis, McNemar's test was used to compare the proportions or test the difference between the proportions with two-sided P value < 0.05, by performing on 2 × 2 contingency table with two discrete dichotomous variables. The null hypothesis of marginal homogeneity is an equal distribution of water-holding containers, as well as Aedes-infested ones, between urban and rural settings whether they are distributed seasonally and domestically. As for the abundance of Aedes vectors, mean (±2 standard errors or SE) was presented to describe the larva numbers of Ae. aegypti or Ae. albopictus in containers observed between two seasons in the urban or rural settings of Narathiwat. The Mann-Whitney U test (P < 0.05) was used to determine whether larva numbers of Ae. aegypti or Ae. albopictus found in each type of containers in wet season are lower or higher than that in the other dry season by comparing the mean ranks of each distribution of Aedes larvae. The null hypothesis is that the distributions are identical and the mean ranks are the same for two-independent samples.