Prevalence and resting behaviour of dengue vectors, Aedes aegypti and Aedes albopictus in dengue high risk urban settings in Colombo, Sri Lanka

Janaki, M.D.S.; Aryaprema, Vindhya S.; Fernando, N.; Handunnetti, S.M.; Weerasena, O.V.D.S.J.; Pathirana, P.P.S.L.; Tissera, Hasitha

doi:10.1016/j.aspen.2022.101961

Cited by 4 publications

(2 citation statements)

References 26 publications

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“…Thus, dengue infection, which has a longer asymptomatic incubation period of up to 2 weeks and then a short-lasting symptomatic illness (around 1 week), can spread rapidly through workplaces and schools, as people from multiple postcodes within and outside the district share close confined spaces within these institutions. The vector mosquito also prefers indoor environments (endophilic) and bites during the daytime [ 40 ], and is ubiquitously present throughout the district [ 41 ], and with all this considered, thus provide the ideal conditions for spread through asymptomatic viremic hosts.…”

Section: Discussionmentioning

confidence: 99%

Genomic Surveillance of Recent Dengue Outbreaks in Colombo, Sri Lanka

Maduranga

Valencia

Sigera

et al. 2023

Viruses

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All four serotypes of the dengue virus (DENV1–4) cause a phenotypically similar illness, but serial infections from different serotypes increase the risk of severe disease. Thus, genomic surveillance of circulating viruses is important to detect serotype switches that precede community outbreaks of disproportionate magnitude. A phylogenetic analysis was conducted on near full length DENV genomes sequenced from serum collected from a prospective cohort study from the Colombo district, Sri Lanka during a 28-month period using Oxford nanopore technology, and the consensus sequences were analyzed using maximum likelihood and Bayesian evolutionary analysis. From 523 patients, 328 DENV sequences were successfully generated (DENV1: 43, DENV2: 219, DENV3:66). Most circulating sequences originated from a common ancestor that was estimated to have existed from around 2010 for DENV2 and around 2015/2016 for DENV1 and DENV3. Four distinct outbreaks coinciding with monsoon rain seasons were identified during the observation period mostly driven by DENV2 cosmopolitan genotype, except for a large outbreak in 2019 contributed by DENV3 genotype I. This serotype switch did not result in a more clinically severe illness. Phylogeographic analyses showed that all outbreaks started within Colombo city and then spread to the rest of the district. In 2019, DENV3 genotype I, previously, rarely reported in Sri Lanka, is likely to have contributed to a disease outbreak. However, this did not result in more severe disease in those infected, probably due to pre-existing DENV3 immunity in the community. Targeted vector control within Colombo city before anticipated seasonal outbreaks may help to limit the geographic spread of outbreaks.

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Section: Discussionmentioning

confidence: 99%

Genomic Surveillance of Recent Dengue Outbreaks in Colombo, Sri Lanka

Maduranga

Valencia

Sigera

et al. 2023

Viruses

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“…Given the importance of Ae. aegypti as the main vector of infectious diseases throughout Mexico, many of its behavioral characteristics are already known, such as its preference for resting indoors [ 28 , 29 ]; therefore, vector control programs currently focus on its ethological dynamics in order to coordinate activities for its control. However, Ae.…”

Section: Introductionmentioning

confidence: 99%

Aedes aegypti, Ae. albopictus and Culex quinquefasciatus Adults Found Coexisting in Urban and Semiurban Dwellings of Southern Chiapas, Mexico

López-Solis

Solís-Santoyo

Saavedra-Rodríguez

et al. 2023

Insects

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Tapachula, Mexico, a tropical city, is an endemic area for dengue, in addition to several outbreaks in the last decade with chikungunya and zika. As part of the migratory corridor from Central to North America and the risks of scattered infectious diseases that this implies, the identification and distribution of potential disease vectors in and around residential areas are essential in terms of entomological surveillance for the prevention of disease outbreaks. The identification of mosquito species of medical importance coexisting in houses and cemeteries in Tapachula and two semiurban sites in southern Chiapas was investigated. Adult mosquitoes were collected from May to December 2018, resting inside and outside houses and in the tombstones and fallen tree leaves in cemeteries. A total of 10,883 mosquitoes belonging to three vector species were collected across 20 sites; 6738 were from neighborhood houses, of which 55.4% were Culex quinquefasciatus, 41.6% Aedes aegypti, and 2.9% Ae. albopictus. Aedes aegypti was the most common mosquito resting inside houses (56.7%), while Ae. albopictus and Cx. quinquefasciatus were mostly found resting outside houses (75.7%). In the cemeteries, Cx. quinquefasciatus (60.8%) and Ae. albopictus (37.3%) were the most abundant, while Ae. aegypti (1.9%) was the least abundant. This is the first report to identify adults of three major disease vector species coexisting in the domestic environment of urban and semiurban sites and Ae. albopictus adult resting inside of urban houses in Mexico. It would be opportune to consider comprehensive strategies that can be applied in this region to control the three species at the same time and avoid outbreaks of the diseases they transmit.

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