Association of dengue fever with Aedes spp. abundance and climatological effects

Betanzos-Reyes, Ángel Francisco; Rodrı́guez, Mario H.; Romero-Martínez, Martín; Sesma-Medrano, Eduardo; Rangel-Flores, Hilda; Santos-Luna, René

doi:10.21149/8141

Cited by 26 publications

(19 citation statements)

References 14 publications

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“…Hence, we anticipate the GOS traps to be able to bring down dengue cases, by trapping (infected) gravid Aedes mosquitoes. Although some studies collectively indicate only a 22% positive correlation between vector indices and dengue cases [53], other studies found significant correlation between weekly Aedes abundance (in egg counts and ovitrap index) with number of confirmed dengue cases [53, 54]. Increase in Ae.…”

Section: Discussionmentioning

confidence: 99%

Gravid oviposition sticky trap and dengue non-structural 1 antigen test for early surveillance of dengue in multi-storey dwellings: study protocol of a cluster randomized controlled trial

et al. 2019

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Background Dengue is a global disease, transmitted by the Aedes vectors. In 2018, there were 80 615 dengue cases with 147 deaths in Malaysia. Currently, the nationwide surveillance programs are dependent on Aedes larval surveys and notifications of lab-confirmed human infections. The existing, reactive programs appear to lack sensitivity and proactivity. More efficient dengue vector surveillance/control methods are needed. Methods A parallel, cluster, randomized controlled, interventional trial is being conducted for 18 months in Damansara Damai, Selangor, Malaysia, to determine the efficacy of using gravid oviposition sticky (GOS) trap and dengue non-structural 1 (NS1) antigen test for early surveillance of dengue among Aedes mosquitoes to reduce dengue outbreaks. Eight residential apartments were randomly assigned into intervention and control arms. GOS traps are set at the apartments to collect Aedes weekly, following which dengue NS1 antigen is detected in these mosquitoes. When a dengue-positive mosquito is detected, the community will be advised to execute vector search-and-destroy and protective measures. The primary outcome concerns the the percentage change in the (i) number of dengue cases and (ii) durations of dengue outbreaks. Whereas other outcome measures include the change in density threshold of Aedes and changes in dengue-related knowledge, attitude and practice among cluster inhabitants. Discussion This is a proactive and early dengue surveillance in the mosquito vector that does not rely on notification of dengue cases. Surveillance using the GOS traps should be able to efficiently provide sufficient coverage for multistorey dwellings where population per unit area is likely to be higher. Furthermore, trapping dengue-infected mosquitoes using the GOS trap, helps to halt the dengue transmission carried by the mosquito. It is envisaged that the results of this randomized controlled trial will provide a new proactive, cheap and targeted surveillance tool for the prevention and control of dengue outbreaks. Trial registration This is a parallel-cluster, randomized controlled, interventional trial, registered at ClinicalTrials.gov (ID: NCT03799237), on 8th January 2019 (retrospectively registered). Electronic supplementary material The online version of this article (10.1186/s40249-019-0584-y) contains supplementary material, which is available to authorized users.

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Section: Discussionmentioning

confidence: 99%

Gravid oviposition sticky trap and dengue non-structural 1 antigen test for early surveillance of dengue in multi-storey dwellings: study protocol of a cluster randomized controlled trial

et al. 2019

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“…However, OPI has been shown to be a good proxy for adult indices [29, 33, 58], so we believe our approach is both appropriate and useful. Finally, this paper aimed to provide a broad characterisation of vector patterns and does not consider seasonality, an important component of vector and dengue transmission dynamics [3, 8, 28, 29, 32, 40, 42].…”

Section: Discussionmentioning

confidence: 99%

“…Similar definitions have been used to study dengue incidence in Belo Horizonte [8, 40]. The eight‐week difference was chosen as a conservative estimate of the temporal lag between egg indices and dengue incidence [41, 42]. This definition aligned the beginning of the study year with the annual nadir, or lowest value, of each variable and allowed us to capture the entire seasonal curve in a single year.…”

Section: Methodsmentioning

confidence: 99%

Spatial analysis of dengue incidence and Aedes aegypti ovitrap surveillance in Belo Horizonte, Brazil

Schultes

Morais

Cunha

et al. 2020

Tropical Med Int Health

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Objectives Understanding the intra‐urban spatial dynamics of Aedes aegypti and dengue transmission is important to effectively guide vector control. Ovitraps are a sensitive, cost‐effective vector surveillance tool, yet few longitudinal studies have evaluated ovitrap indices and dengue occurrence. We aimed to assess the spatial patterns of dengue incidence and Ae. aegypti ovitrap positivity index (OPI) over time and to examine the spatial relationship between these two variables. Methods This study used 12 years (2007–2018) of dengue case records and biweekly Ae. aegypti ovitrap data in Belo Horizonte, Brazil. We aggregated data by year and health centre catchment area (n = 152) and used both univariate and bivariate global Moran’s I statistic and LISA to evaluate spatial clustering. Results Annual dengue incidence ranged from 18 to 6262/100 000 residents and displayed spatial autocorrelation in 10/12 years, with shifting areas of high incidence. Annual OPI ranged from 35.7 to 47.6% and was clustered in all study years, but unlike dengue had consistent spatial patterns over time. Bivariate analysis found both positive (6/12 years) and negative (1/12 years) spatial associations between the two variables. Conclusions Low detected presence of Ae. aegypti was not a limiting factor in dengue transmission. However, stable spatial distribution of OPI suggests that certain areas may have persistent breeding sites. Future research should identify factors related to persistent Ae. aegypti hotspots to better guide vector management. Vector control efforts should be paired with additional data on population immunity, circulating serotypes and urban factors to better predict and control outbreaks.

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“…To analyze mosquito density, we used the Human Hour Bite Index (HHBI), which is a useful entomological indicator to estimate the presence and abundance of populations of adult insect vectors 73 . The HHBI calculates the number of mosquitoes feeding on a person per hour, using the following formula:

HHBI = \frac{total mosquitoes captured}{number of collection hours \times number of collectors}

These records were made over 13 days distributed over five observation months: June, July, September, October and November, which include the months of highest rainfall in Cuernavaca and coincide with the maximum emergence of adult mosquitoes 74 …”

Section: Methodsmentioning

confidence: 99%

Adult damselflies as possible regulators of mosquito populations in urban areas

Córdoba‐Aguilar

Miguel-Rodríguez

Rocha‐Ortega

et al. 2021

Pest Management Science

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BACKGROUND Dragonfly and damselfly larvae have been considered as possible biocontrol agents against young instars of mosquito vectors in urban environments. Yet our knowledge about adult odonate predation against mosquito adults is scarce. We quantified daily and annual predation rates, consumption rates and prey preferences of adult Hetaerina vulnerata male damselflies in an urban park. A focus on predation of mosquito species was provided, quantified their arbovirus (dengue, chikungunya and Zika) infection rates and biting activity. RESULTS Foraging times of H. vulnerata overlapped with those of the maximum activity of hematophagous mosquitoes. The most consumed preys were Diptera and Hymenoptera and, in lower quantities, Hemiptera, Coleoptera, Trichoptera, Psocoptera and Neuroptera. Of note, 7% of the diet was represented by hematophagous dipterans, with 2.4% being Aedes aegypti and Aedes albopictus. Prey abundance in the diet coincided with that of the same species in the environment. The arboviral infection rate (dengue, chikungunya and Zika) was 1.6% for A. aegypti and A. albopictus. The total biting rate of these mosquito vectors was 16 bites per person per day, while the annual rate of infectious bites was 93.4. CONCLUSION Although 2.4% for both Aedes species seems a low consumption, considering the presence of 12 odonate species at the park, it can be argued that adult odonates may play a relevant role as mosquito vector regulators, therefore impacting the spread of mosquito‐borne diseases. Our study outlines the need for further research on the topic of the possible role of adult odonates for mosquito biocontrol. © 2021 Society of Chemical Industry.

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Association of dengue fever with Aedes spp. abundance and climatological effects

Cited by 26 publications

References 14 publications

Gravid oviposition sticky trap and dengue non-structural 1 antigen test for early surveillance of dengue in multi-storey dwellings: study protocol of a cluster randomized controlled trial

Gravid oviposition sticky trap and dengue non-structural 1 antigen test for early surveillance of dengue in multi-storey dwellings: study protocol of a cluster randomized controlled trial

Spatial analysis of dengue incidence and Aedes aegypti ovitrap surveillance in Belo Horizonte, Brazil

Adult damselflies as possible regulators of mosquito populations in urban areas

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