Prevalence and insecticide susceptibility of dengue vectors in the district of Batticaloa in eastern Sri Lanka

Dharshini, Sangaralingam; Vinobaba, M.; Jude, Pavilupillai J.; Karunaratne, S.H.P.P.; Surendran, Sinnathamby N.

doi:10.2149/tmh.2010-19

Cited by 9 publications

(12 citation statements)

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“…are resistant to insecticide in indoor or outdoor spraying. A study conducted in Sri Lanka showed Aedes aegypti and Aedes albopictus were highly resistant to DDT and they can oviposit indoors and outdoors [14]. Another study in Bangladesh reported abundant potential larval habitats for Aedes sp.…”

Section: Discussionmentioning

confidence: 99%

Laboratory testing of very low-copper-treated water to prolong pupation and emerging time of mosquito larvae: an alternative method to delay mosquito breeding capability

Reza

Ilmiawati

2019

Preprint

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IntroductionLarvicide application in ovitrap is one of the currently available methods used in mosquito eradication campaign because they eliminate the larval stage. We previously reported that copper in liquid form is a promising candidate due to its potent larvicide properties in a laboratory setting and even in the field. In the field study, several larvae survived in the ovitrap due to the dilution of copper concentration by the rain. The surviving larvae were smaller and less motile. This led our interest to study the effect of a sub-lethal dose of copper in ovitrap on larvae development, pupation time and lifespan in the adult stage.MethodsFirst instar larvae of three species of mosquito (Aedes albopictus, Culex pipiens and Anopheles stephensi) were bred in copper-treated water at a concentration of 0.60 ppm, 0.30 ppm, and 0.15 ppm and compared with the control group. The surviving larvae were recorded every day in terms of pupa emerging time and adult emerging time. The number of adult mortality was recorded and compared with the control.ResultsCopper showed potent larvicide effect in the 0.60 ppm concentration and prolonged pupation time and caused a significantly lower number of emerging mosquitoes down to the lowest concentration of 0.15 ppm. The adult lifespan was not different compared to the control.ConclusionThis study demonstrates the capability of copper below 1 ppm to prolong the pupation time and the emerging time of mosquito larvae. Our findings open the possibility of copper application to cut mosquito breeding capacity that eventually will reduce disease transmission.

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Section: Discussionmentioning

confidence: 99%

Laboratory testing of very low-copper-treated water to prolong pupation and emerging time of mosquito larvae: an alternative method to delay mosquito breeding capability

Reza

Ilmiawati

2019

Preprint

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“…Aedes aegypti tends to predominate during the pre-monsoon season and Aedes albopictus during the monsoon season. Since the monsoon rain in Batticaloa district from October to December, the density of Aedes mosqutoes increases during this period and a positive association between rainfall and Aedes density has been observed [5].…”

Section: Fig 1 Map Of Sri Lanka (Eastern Province Has Been Colored)mentioning

confidence: 90%

“…Also there was a positive relationship between the number of Aedes eggs and rainfall and humidity but not with temperature. Dharshini et al also conducted Aedes egg survey and larval survey in Batticaloa district of Sri Lanka [5]. They observed a positive association between rainfall and Aedes density.…”

Section: Fig 1 Map Of Sri Lanka (Eastern Province Has Been Colored)mentioning

confidence: 99%

“…Most of climate studies on dengue have been done in the central province and Western province of Sri Lanka [23,24,26], where the climate differs significantly from that of the Eastern province of Sri Lanka. Only few studies have been done on the relationship between climate and dengue incidences in Batticaloa [5] and those studies were limited to data which were collected from only Batticaloa district in the Eastern Province of Sri Lanka. The objective of this study is to identify the impact of climatic factors on the density (in terms of number) of dengue incidences in the Eastern province of Sri Lanka, which has three districts Batticaloa, Trincomalee and Amapra.…”

Section: Chakravarti Et Al Designed a Relationship Of Dengue Infectimentioning

confidence: 99%

“…The first island-wide outbreak was reported in 1965 [4]. Both Aedes aegypti and Aedes albopictus are widespread in Sri Lanka [5] and all four serotypes have been circulating in the country for more than three decades [6]. Aedes aegypti is the primary dengue vector in most endemic countries and a highly domesticated urban mosquito that lives close to human residences where they develop as adults [7].…”

Section: Introductionmentioning

confidence: 99%

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Impact of Climatic Factors on Dengue Incidences in Eastern Province, Sri Lanka

Karunarathna

Sriranganesan

2020

IJTDH

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Introduction: Health sector is one of the most important sectors of any country. Many aspects such as diseases, health practices, and institutions are associated with health. Among different infectious diseases, dengue has become a major health issue for human in most tropical and subtropical regions. It is a viral disease originated and spread from mosquito and it is in several forms. Since, this seriously affects human life, taking necessary measures, including policies, rules, regulation and best practices to bring this menace into a minimum level, is essential. Such actions require proper background about the disease including factors that this disease depends on. Several factors may be associated with dengue fever and climatic variables take a greater place. Effect of these variables may vary from area to area. Aims: This study aimed to investigate the impact of climatic variables for progression of dengue disease in the Eastern Province of Sri Lanka, which is consisted of three districts: Batticaloa; Trincomalee and Ampara. Study Design: Number of dengue incidences and climatic variables such as rainfall, temperature, number of rainy days, day time humidity, night-time humidity, number of sunny days, and UV Index were obtained for each month in the period from 2009 to 2017 from Meteorology Department and statistical abstracts of Sri Lanka. Analysis was carried out by using the statistical techniques: correlation analysis; regression analysis; principle component analysis and a graphical technique, contour maps. Results: Only a few climatic factors affect dengue incidences in these three districts. However, no any regular pattern could be observed. Impact of each climatic factor varies from district to district. In Batticaloa district, a number of rainy days and day time humidity affect dengue incidences negatively and positively respectively meanwhile wind speed positively affects dengue incidences in Ampara district. No any climatic variables in Trincomalee district show a relationship with dengue incidences in the district. In general, moderate humidity creates a favourable situation for the spread of dengue disease irrespective of districts. Heavy rainfall does not show a relation with dengue incidences as people believe. Conclusion: It is difficult to investigate the impact of each climatic factor alone on dengue incidences because there are inter correlated. Number of dengue incidences may depend on many other variables such as population density, geographical location, health practices, personal health status, knowledge, policies of different institutes and organizations. It is essential to incorporate these sorts of variables also to have a proper understanding of the dengue disease and its spread.

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Evolution of dengue in Sri Lanka—changes in the virus, vector, and climate

Sirisena

Noordeen

2014

International Journal of Infectious Diseases

158

147

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Despite the presence of dengue in Sri Lanka since the early 1960s, dengue has become a major public health issue, with a high morbidity and mortality. Aedes aegypti and Aedes albopictus are the vectors responsible for the transmission of dengue viruses (DENV). The four DENV serotypes (1, 2, 3, and 4) have been co-circulating in Sri Lanka for more than 30 years. The new genotype of DENV-1 has replaced an old genotype, and new clades of DENV-3 genotype III have replaced older clades. The emergence of new clades of DENV-3 in the recent past coincided with an abrupt increase in the number of dengue fever (DF)/dengue hemorrhagic fever (DHF) cases, implicating this serotype in severe epidemics. Climatic factors play a pivotal role in the epidemiological pattern of DF/DHF in terms of the number of cases, severity of illness, shifts in affected age groups, and the expansion of spread from urban to rural areas. There is a regular incidence of DF/DHF throughout the year, with the highest incidence during the rainy months. To reduce the morbidity and mortality associated with DF/DHF, it is important to implement effective vector control programs in the country. The economic impact of DF/DHF results from the expenditure on DF/DHF critical care units in several hospitals and the cost of case management.

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Prevalence and insecticide susceptibility of dengue vectors in the district of Batticaloa in eastern Sri Lanka

Cited by 9 publications

References 1 publication

Laboratory testing of very low-copper-treated water to prolong pupation and emerging time of mosquito larvae: an alternative method to delay mosquito breeding capability

Laboratory testing of very low-copper-treated water to prolong pupation and emerging time of mosquito larvae: an alternative method to delay mosquito breeding capability

Impact of Climatic Factors on Dengue Incidences in Eastern Province, Sri Lanka

Evolution of dengue in Sri Lanka—changes in the virus, vector, and climate

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