Study on Entomological Surveillance and its Significance during a Dengue Outbreak in the District of Tirunelveli in Tamil Nadu, India

Basker, Parasuraman; Kannan, Pichai; Porkaipandian, Rajagopal Thirugnanasambandam; Saravanan, S.; Sridharan, Subramaniam; Kadhiresan, Mahaligam

doi:10.1016/j.phrp.2013.04.005

Cited by 16 publications

(9 citation statements)

References 10 publications

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“…23 HI, CI, and BI of 48.2%, 28.6%, and 48.2% was reported from Tirunelveli during a dengue outbreak. 24 There is a significant association between education of the respondents and awareness regarding breeding habits of mosquitoes. A significant association between education and knowledge of breeding places was also reported by Kumanan et al 25 There is a significant association between awareness of dry day and observation of dry day practices in our study.…”

Section: Vector Surveymentioning

confidence: 99%

Knowledge and preventive practices regarding dengue in an urban area of Palakkad

Chakkanmattil¹,

Zachariah²,

Soman³

et al. 2019

Int J Community Med Public Health

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Background: Dengue is the most rapidly spreading viral disease in the world. Kerala had reported high incidence of dengue cases recently including deaths. Integrated vector management is the most effective method of vector control which requires community participation. As high incidence of dengue cases are reported in Palakkad district, it is imperative to assess the knowledge level and preventive practices followed by the community. This will help to formulate further action plans including awareness creation and behaviour change.Methods: A cross sectional study was conducted in two randomly selected wards of Palakkad municipality from July to August 2017. An adult from each household was interviewed using a semi-structured questionnaire. The household and its surroundings were also observed to identify breeding sources and calculate relevant vector indices.Results: 95.9% of informants knew that dengue is transmitted through bite of infected mosquito. 67.8% felt that dengue mosquito bites during the daytime. 53.0% of the families observed dry day practices. 15.8% used mosquito repellent creams and only 25.9% used mosquito nets. The house index, container index and breteau index were found to be 24.60%, 23.55% and 33.43% respectively.Conclusions: The awareness regarding modes of transmission and biting time of Aedes mosquito is good but the usage of personal protective measures is quite low. Although majority of the respondents had knowledge about breeding places, there were significant numbers of breeding sources especially plastic containers. Vector indices were also high indicating risk of transmission of dengue.

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Section: Vector Surveymentioning

confidence: 99%

Knowledge and preventive practices regarding dengue in an urban area of Palakkad

Chakkanmattil¹,

Zachariah²,

Soman³

et al. 2019

Int J Community Med Public Health

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“…aegypti distribution or coexistence of these two types of mosquitoes may not be suitable for the areas with only Ae. albopictus distribution (Basker et al …”

Section: Introductionmentioning

confidence: 99%

Identification of Aedes albopictus larval index thresholds in the transmission of dengue in Guangzhou, China

Luo

Xiao

et al. 2015

Journal of Vector Ecology

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Entomological indices have been used to quantitatively express vector density, but the threshold of larval indices of Aedes albopictus in dengue epidemics is still undefined. We conducted a case-control study to identify the thresholds of Aedes albopictus larval indices in dengue epidemics. Two unit levels of analysis were used: district and street. The discriminative power of the indices was assessed by receiver operating characteristic (ROC) curves. The association between the entomologic indices and dengue transmission was further explored by a logistic regression model. At the district level, there was no significant difference in the Breteau index (BI) between districts that reported cases and those did not (t=0.164, p>0.05), but the Container index (CI) did show a significant difference (t=2.028, p<0.01). The AUC (Area Under the Curve) of BI, CI, and prediction value were 0.540, 0.630, and 0.533, respectively. Predicting at the street level, the AUC of BI, CI, and prediction values were 0.684, 0.660, and 0.685, respectively, and 0.861, 0.827, and 0.867 for outbreaks. BI=5.1, CI=5.4, or prediction value =0.491were suggested to control the epidemic efficiently with the fewest resources, where BI=4.0, CI=5.1, or PRE =0.483 were suggested to achieve effectiveness. Journal of Vector Ecology 40 (2): 240-246. 2015.

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“…The findings are in line with a similar study done in Tirunelveli district in Tamilnadu where the HI, CI and BI were 48.2%, 28.6%, and 48.2% respectively. 16 HI describes the distribution of mosquito in a region. According to WHO and NVBDCP, an area is mentioned to be at high risk for the spread of dengue if it has HI> 10%, and low risk when HI <1%, which means that the villages is at high risk for dengue transmission.…”

Section: Discussionmentioning

confidence: 99%

Assessment of dengue mosquito breeding sources and source reduction at a coastal village in Puducherry

Venkataraman¹,

Sahithyaa²,

Sugumaran³

2019

Int J Community Med Public Health

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Background: Dengue virus can cause a wide range of illness in humans, from unapparent infection, to classic dengue fever and to fatal dengue haemorrhagic fever. Until a vaccine becomes available for public health use, primary prevention of transmission is crucial to decrease the burden of dengue, and control of Aedes is the only available strategy.Methods: The mosquito larval survey was carried out in the month of November 2017 in Echangadu, a coastal village in Puducherry to assess mosquito breeding sources for the presence of dengue vector species. The survey was performed by selecting houses where freshwater was available. For each household, the presence or absence of possible breeding sources were recorded, as well as the presence or absence of mosquito larvae.Results: Of the 102 houses surveyed, 20 of the houses were infested with Aedes larvae. A total of 182 containers were found in these households of which 47 containers were positive for Aedes larvae. Coconut shells, plastic, metal and discarded containers were the most often found breeding sites.Conclusions: The larval surveillance indicators among the households surveyed revealed a very high risk of future dengue outbreak in the village. All the containers examined including those positive for Aedes larvae were safely disposed.

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Study on Entomological Surveillance and its Significance during a Dengue Outbreak in the District of Tirunelveli in Tamil Nadu, India

Cited by 16 publications

References 10 publications

Knowledge and preventive practices regarding dengue in an urban area of Palakkad

Knowledge and preventive practices regarding dengue in an urban area of Palakkad

Identification of Aedes albopictus larval index thresholds in the transmission of dengue in Guangzhou, China

Assessment of dengue mosquito breeding sources and source reduction at a coastal village in Puducherry

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