Influence of strategic points in the dispersion of Aedes aegypti in infested areas

Abstract

OBJECTIVE: To evaluate whether sites with large amount of potential breeding sites for immature forms of Aedes aegypti, called strategic points, influence in the active vector’s dispersion into properties in their surroundings. METHODS: We selected four areas in the municipality of Campinas, three of them with strategic points classified as high, moderate, and low risk according to infestation and a control area, without strategic points. Between October 2015 and September 2016, we monthly installed oviposition traps and evaluated the infestation by Ae. aegypti in all properties of each selected area. To verify if there was vector dispersion from each strategic point, based on its location, we investigated the formation of clusters with excess of eggs or larvae or pupae containers, using the Gi spatial statistics. RESULTS: The amount of eggs collected in the ovitraps and the number of positive containers for Ae. aegypti did not show clusters of high values concerning its distance from the strategic point. Both presented random distribution not spatially associated with the positioning of strategic points in the area. CONCLUSIONS: Strategic points are not confirmed as responsible for the vector’s dispersion for properties in their surroundings. We highlight the importance of reviewing the current strategy of the vector control program in Brazil, seeking a balance from the technical, operational, and economic point of view, without disregarding the role of strategic points as major producers of mosquitoes and their importance in the dissemination of arboviruses in periods of transmission.

A Perspective on Inhabited Urban Space: Land Use and Occupation, Heat Islands, and Precarious Urbanization as Determinants of Territorial Receptivity to Dengue in the City of Rio De Janeiro

“…that are considered possible macro breeding sites available for Aedes vectors. Thus, the hypothesis that supports this indicator is that the higher the percentage of the area classified as a strategic point, the greater the risk for dengue [30].…”

Geographic Information System-based association between the sewage network, geographical location of intermediate hosts, and autochthonous cases for the estimation of risk areas of schistosomiasis infection in Ourinhos, São Paulo, Brazil

“…This tool, with the support of geographic information systems (GIS), uses the geographic coordinates of locations to find spatial clusters of a certain measure or quantity around a specific point and infer the distances at which these clusters are statistically significant 15 . Previous studies have used this tool (Gi or Gi* statistics) to analyze schistosomiasis in Africa 16 , 17 , 18 , 19 and vector-borne diseases, such as dengue , in Brazil 20 . Additionally, other studies have investigated schistosomiasis using GIS worldwide 5 , 21 , 22 , 23 .…”

Identificação e classificação de áreas urbanas propícias à existência de criadouros do mosquito Aedes Aegypti via sensoriamento remoto

“…Os imóveis considerados como PEs recebem uma pontuação e são classificados segundo classes de importância em grande, média e pequena. Além dessa classe de importância, são avaliados anualmente e qualificados quanto ao risco de infestação em alto, médio e baixo (BARBOSA et al, 2019).…”

“…Os PEs são propriedades, como lojas de pneus e depósitos, empresas de materiais de construção e depósitos de materiais recicláveis, com uma grande quantidade de potenciais locais de reprodução para as formas imaturas do mosquito (Barbosa et al, 2019 O período Primavera/Verão é considerado mais favorável ao desenvolvimento do vetor (CHADEE, 2004;DOWLING et al 2013;FAVARO et al 2013;LADEAU et al 2013;LITTLE ET AL. 2017;BARBOSA et al 2019;LORENZ et al (2020)…”

“…Além disso, foi também realizada a classificação dos imóveis pelo ICM. Para maiores informações desse estudo ver Barbosa et al, 2019. Conforme já comentado e considerando a sazonalidade do vetor, os imóveis foram visitados quatro vezes, sendo que o ICM foi medido para cada um dos imóveis em cada uma das visitas realizadas, buscando representar a condição do imóvel em todos os períodos do ano.…”