Occurrence of Aedes aegypti (L.) on indoor resting sites in Mahasarakham Province

Abstract

Aedes aegypti (L.) isa vector of dengue hemorrhagic fever. Most research has focused onthecontrol of immature habitats and conditions for adult emergence. However, eliminating immature habitats cannot reduce the dengue fever outbreaks. Therefore, to prevent disease spreading, adult mosquitoes should be eliminated. One way to achieve this is by spraying insecticide in areas where the adults rest. The objective of this study was to investigate the indoors resting behavior of Ae. aegypti in 120 houses of the rural area in Mahasarakham Province. The study was conducted from May to August 2019. The adult mosquitoes were collected inside the house using Prokopack aspirator. A total of 946 Ae. aegypti adult was collected and 430 females and 516 males were recorded. Aedes aegypti resting site was found mainly in the bedroom and the incidence rate ratioof Ae. aegypti adult in thebedroom was higher than in the bathroom, kitchen and living room: 20, 21 and 15 times, respectively. The resting location in each room was measured at 3 different heights of 0-0.75 m, 0.75 – 1.5 m and >1.5 m. The result showed that the incidence rate ratio of mosquitoes at the height of 0.75-1.5 m was higher than the height of 0 – 0.75 m and > 1.5 m about 20 and 46 times. The numbers of collected mosquitoesin the morning and the afternoon were no statistically significant difference (P>0.05). This information of indoor resting behavior of adult Ae. aegypti can be utilized to choose the most appropriate and effective prevention method for the control of dengue fever outbreaks.