High and Low Risk Dengue Haemorrhagic Fever Areas Affecting Key Breeding Place of Aedes aegypti (L.) and Ae. albopictus (Skuse) in Nakhon Si Thammarat, Southern Thailand (original) (raw)
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Asia-Pacific Journal of Science and Technology, 2015
The objectives were to survey Aedes aegypti larval breeding habitats and analyze dengue vector indices. This larval vector survey was conducted in Dongklang village in Ubon Ratchathani province over two years in 2012 and 2013. During each year, dengue vector indices, House Index (HI), Container Index (CI), and Breteau Index (BI), were collected for two periods, dry season (January-April) and wet season (May-August). The number of households infested with larvae in the different years and periods were compared using chi-square test. The results showed in 2012, HI, CI, and BI were 52.7%, 19.9%, and 135.1% respectively in the dry season. In the wet season, the indices decreased. In 2013, dengue vector indices again tended to decrease from dry seasonal to wet seasonal periods. The numbers of households that were infested by Aedes larvae did not differ between years and seasons. Dengue vector indices are alternative methods to predict Aedes mosquito distribution and can be used in the m...
Development sites of Aedes aegypti and Ae. albopictus in Nakhon Si Thammarat, Thailand
This study investigated how the seasons affect the development sites of Aedes larvae in three topographical areas: mangrove, rice paddy fields and mountainous areas. We examined how the number of Aedes larvae varied in different types of water containers. Water containers were categorized into the following groups: indoor/outdoor containers, artificial/natural containers, earthen/plastic containers, containers with/without lids and dark/light-coloured containers. Samples were collected from 300 households in both the wet and dry seasons from three topographical areas in Nakhon Si Thammarat province with 100 households per topographical area. The results showed that in the wet season, there were higher numbers of Ae. aegypti and Ae. albopictus larvae than in the dry season. Moreover, the number of Ae. albopictus larvae was higher in mountainous areas than in mangrove and rice paddy areas, in both the wet and dry seasons. The number of positive containers was higher in outdoor contain...
Dengue fever (DF), one of the most important emerging arboviral diseases, is transmitted through the bite of container breeding mosquitoes Aedes aegypti and Aedes albopictus. A household entomological survey was conducted in Dhaka from August through October 2000 to inspect water-holding containers in indoor, outdoor, and rooftop locations for Aedes larvae. The objective of this study was to determine mosquito productivity of each container type and to identify some risk factors of households infested with Aedes larvae. Of 9,222 households inspected, 1,306 (14.2%) were positive for Aedes larvae. Of 38,777 wet containers examined, 2,272 (5.8%) were infested with Aedes larvae. Containers used to hold water, such as earthen jars, tanks, and drums were the most common containers for larval breeding. Tires in outdoor and rooftop locations of the households were also important for larval breeding. Although present in abundance, buckets were of less importance. Factors such as independent household, presence of a water storage system in the house, and fully/partly shaded outdoors were found to be significantly associated with household infestation of Aedes larvae. Identification and subsequent elimination of the most productive containers in a given area may potentially reduce mosquito density to below a level at which dengue transmission may be halted.
BMC Public Health
Background Controlling sites where mosquitos breed is a key strategy in breaking the cycle of infectious transmission of the dengue virus. Preventive behaviors, such as covering water containers with lids and adding temephos (commercially named Abate sand) in water containers are needed to reduce and control mosquito breeding sites. This study aimed to investigate the impact of dengue-preventive behaviors on Aedes immature production. Methods This cross-sectional study used in-person interviews to record occurrence of dengue-preventive behaviors in Bang Kachao, Samut Prakan Province, Thailand. Larval mosquitos in and around houses were observed and recorded, and covered 208 households. Results It was found that 50% of these households had containers for drinking water and 94% used water containers. Covering water containers with effective lids showed the best success among dengue-preventive behaviors for reducing Aedes immature production. Adding temephos in water containers also wa...
2018
Key containers are various kinds of water reservoirs where most of dengue vector breeding in them. Identification of key containers is important in order to know what dengue vector population control's target. This study aimed to know the type of containers in the dengue endemic areas of Banten Province and determine the key containers as the main target in vector control. A survey has been done in Cilegon (Bendungan, Panggung Rawi, and Samangraya), Serang (Cipare, Banjaragung, and Unyur), South Tangerang (Bendabaru, Baktijaya, Jalupang). Larvae survey conducted on 100 houses in each location by observing the presence or absence of mosquito larvae in water reservoirs (containers) act as potential breeding sites of Aedes aegypti both inside and outside of the house. The survey results were the types of containers, container number, container number with positive mosquito larvae, the key container, and entomology indices in each area. Various types of containers found in nine ende...
Larval Infestations of Aedes aegypti and Ae. albopictus in Nakhonsrithammarat, Thailand
2005
This study investigated the prevalence of Aedes larvae in two different topographical areas (i.e. seaside and mountainous area) and in two faith-based communities (i.e. Buddhist and Muslims). Samples were collected by using the stratified simple random sampling with a total of 400 households from all communities in 31 sub-districts. The results showed that Aedes larvae were mostly found in artificial containers including water containers in bathrooms, potted plants, animal pans, concrete tanks and water jars. Ae. albopictus larvae were found in higher numbers in the seaside area than in the mountainous area. All three Aedes larval indices: Container Index (CI), House Index (HI) and Breteau Index (BI), indicated a high risk of DHF transmission in both locations and faith-based communities. We also found that the HI in Muslim households was more than in Buddhist households.
Journal of Physics: Conference Series, 2019
The number of dengue hemorrhagic fever (DHF) cases endemic at the village Sei Kera Hilir I Sub-district Medan Perjuangan Medan City since 2017 which was 46 cases. One cause of the spread of dengue fever was a place of water container around the house that became the breeding ground for Aedes aegypti. This study aimed to know the relationship of presence of larva Aedes aegypti at water container with DHF incidence in the village Sei Kera Hilir 1 Sub-district Medan Perjuangan Medan City. This research was an analytic observational study with cross sectional design. The samples of this study were 100 homes taken by cluster sampling. The data was analyzed using Fisher’s Exact Test. The most commonly used water container was the bucket (56%), the most common water container with Aedes aegypti was the dispenser (16%), and there were 10 respondents with a history of DHF in the last 1 year. In bivariate analyses, the presence of larvae Aedes aegypti in water container significantly related ...
–A cross-sectional study was conducted in urban community of Thanlyin Township, Yangon Region during 2014 to determine Aedes larval indices and the occurrence of Dengue Haemorrhagic Fever (DHF) within past one year. A total of 327 households and 1491 members were included in the study. Aedes larval indices detected in this study were 25.7% for house index, 15.5% for container index and 48.0% for Breteau index. The occurrence of DHF among households and family members were 2.1% (95% CI: 0.9%, 4.4%) and 0.6% (95% CI: 0.3%, 1.1%), respectively. The occurrence was highest among 5 to 14 years age-group. No case was reported among persons with equal or more than 60 years of age. Mortality and case fatality rates were 0% during study period. Larval positivity among households was significantly related to sufficiency of family income and number of water container they have. Surveillance and control procedures for both DHF and vector should be intensified in urban area. Awareness and participation of the community in prevention and control of DHF should also be raised. Socioeconomic status as well as proper water supply and storage should be improved in urban area.
This research was aimed to describe the density pattern and the fluctuation of Aedes aegypti larval based on the season in dengue haemorrhagic fever (DHF) endemic area in Surabaya city. The population of the research was the house of people together with its breeding sites either inside and outside the house. The 55 houses were randomly chosen in 11 RWs in Nginden Subdistrict. The sample of this research was Aedes aegypti larva obtained from its breeding sites. The sample sizes were all of the larval in the containers existed in the chosen houses. The samples of the larval were taken and carried for identification and documentation of the species. This research was applied in the same houses in January, March, and May 2008 in rainy season. The results indicated that the highest larval index occurred in January with House Index (HI) 76.8%, Container Index (CI) 40.5%, and Breteau Index (BI) 137.5%. There was a decrease in March with HI 63.3%, CI 31.3%, and BI 92.7%. It continued to de...
International Journal of Scientific Research and Management
Dengue Hemorrhagic Fever (DHF) is an infectious disease that can be fatal. There were 117 DHF cases in Ogan Ilir Regency in 2018. The presence of Aedes aegypti and community behavior in mosquito breeding eradication are critical for dengue vector larvae survival. The purpose of this research is to establish a link between the presence of Aedes aegypti larvae and the presence of DHF in Beti Village, South Indralaya District, Ogan Ilir Regency, South Sumatra Province. This was an observational cross-sectional study with 49 randomly selected resident houses. The presence of larvae in water reservoirs was used to collect data, whereas the incidence of DHF was obtained through questionnaire interviews with respondents. For statistical analysis, the chi-square test was used. According to the findings of the study, 38.8 percent of respondents have a history of DHF. The majority of the larvae were discovered in water reservoir buckets. There is a link between the type of Aedes aegypti breed...