Characteristics of water containers influencing the presence of Aedes immatures in an ecotourism area of Bang Kachao Riverbend, Thailand (original) (raw)
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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...
Effectiveness of dengue control practices in household water containers in Northeast Thailand
Tropical Medicine and International Health, 2005
objective To investigate the influence of larval control methods (using temephos, keeping fish and covering containers with lids), water use and weekly cleaning of containers on the presence of Aedes aegypti larvae in water-storage containers in rural and urban households in Khon Kaen province. method Cross-sectional questionnaire survey and larval survey covered 966 households and 5821 containers were inspected. result In rural and urban areas larval control was patchy and often ineffective. Consequently, the mosquito indices exceed the target indices for dengue control with the Breteau Indices of 201 and 113, and Container Indices of 25 and 28 in rural and urban areas, respectively. The containers most frequently infested with larvae were rectangular cement containers storing water for bathing (rural: 37.2%; urban: 35%) and flushing the toilets (rural: 35.7%; urban: 34.3%). Keeping fish [adjusted odds ratio (AOR): 0.08-0.16] was the most effective methods of control. Correctly covering containers with lids was similarly effective (AOR: 0.10-0.25) when used on jars for storing drinking water. However, frequent use of containers reduced the effectiveness of lids. Temephos was effective only in dragon jars in urban areas (AOR: 0.46) where a standard package of temephos were available. Weekly cleaning of containers was an effective method for larval control in most types of containers. A combination of control methods increased effectiveness. conclusion This study highlights the complex interaction of household water use and larval control practices as well as the importance of determining the most effective control measures compatible with water practices for implementing control promotion.
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.
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...
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...
Container types and water qualities affecting on number of Aedes larvae in Trang province, Thailand
Walailak Procedia, 2018
This study investigated the effects of container types, and water qualities on numbers of Aedes mosquito larvae. Mosquito larvae were collected from nine sub-districts with ten households per sub-district in Trang province in March 2017 (i.e. Nongtrut, Natoming, Khuanpring, Bangrak, Khoklo, Banpho, Namphud, Tubtheang, and Nayongtai districts). We collected mosquito larvae in water containers using fishnets (0.55 mm mesh size) and preserved the mosquito larvae in 70% ethanol in the laboratory. We grouped containers in three groups (jar and tank, dustbins and others such as areca nut preservation jars and animal food bowls). We recorded water qualities in each container (presence of vegetation and algae, water level, odour, turbidity, temperature and pH). We identified the mosquito larvae to genus level and counted the numbers. We calculated the mosquito larvae indices (House index (HI), (Breteau index (BI), and Container index (CI)). For this study, we focused only on Aedes species; other species were discarded. We observed that container types, presence of algae in water, water odour, temperature and pH did not have effects on Aedes species larval numbers. Larval numbers were higher in clear and without vegetation water than in turbid and vegetative water, respectively. In addition, 50-75% of water level in the containers was the most preferred level for the Aedes species. Among nine sub-districts, Khoklo, Banpho, and Tubthiang had the highest HI, and Tubthiang had the highest BI and CI.
2021
Background: High water demand accompanied with an unreliable piped water supply has forced urban residents to store water in containers. This situation potentially increases the number of breeding sites for mosquito vectors, such as Aedes. Method: This study aimed to test the hypothesis if piped water connection availability, tap water use, and highly stable tap water supply can help minimize the use of water storage containers as well as the presence of larvae and number of adult Aedes mosquitoes. We conducted a community-based entomological survey of 343 households from 36 neighborhoods or Rukun Tetangga in Makassar City, Indonesia. Our model based on the hypothesis was tested by piecewise structural equation modeling analysis. Results: A significant negative correlation was found between the stability of tap water supply and the number of water storage containers (−0.16, P < 0.05). Of the two categories of water storage containers, the unintentional water storage containers de...
International Journal of Environmental Research and Public Health, 2021
Aedes aegypti is the main vector of dengue globally. The variables that influence the abundance of dengue vectors are numerous and complex. This has generated a need to focus on areas at risk of disease transmission, the spatial-temporal distribution of vectors, and the factors that modulate vector abundance. To help guide and improve vector-control efforts, this study identified the ecological, social, and other environmental risk factors that affect the abundance of adult female and immature Ae. aegypti in households in urban and rural areas of northeastern Thailand. A one-year entomological study was conducted in four villages of northeastern Thailand between January and December 2019. Socio-demographic; self-reported prior dengue infections; housing conditions; durable asset ownership; water management; characteristics of water containers; knowledge, attitudes, and practices (KAP) regarding climate change and dengue; and climate data were collected. Household crowding index (HCI...
This study investigated key breeding sites of Aedes aegypti (L.) and Ae. albopictus (Skuse) in high and low risk dengue haemorrhagic fever (DHF) areas. Ae. aegypti and Ae. albopictus larvae were found in 11 out of 29 types of water containers in both high and low risk DHF areas. Ae. aegypti larvae were found most in outdoor area containers in high risk DHF areas and in metal boxes in low risk DHF areas. On the other hand, Ae. albopictus larvae were found most in indoor earthen jars in low risk DHF areas and in areca containers in high risk DHF areas. The number of Ae. albopictus larvae found in the earthen jars and metal or plastic boxes in low risk areas were higher than in high risk DHF areas. Larval indices (i.e. HI and BI) in both high and low risk DHF areas were greater than 10 % and 50 %, respectively, which indicated high risks of DHF transmission.