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

Autor: Schultes OL; Urban Health Observatory of Belo Horizonte, Federal University of Minas Gerais, Brazil., Morais MHF; Municipal Health Department, Belo Horizonte, Brazil., Cunha MDCM; Urban Health Observatory of Belo Horizonte, Federal University of Minas Gerais, Brazil., Sobral A; National School of Public Health, Oswaldo Cruz Foundation, Rio de Janeiro, Brazil., Caiaffa WT; Urban Health Observatory of Belo Horizonte, Federal University of Minas Gerais, Brazil.
Jazyk: angličtina
Zdroj: Tropical medicine & international health : TM & IH [Trop Med Int Health] 2021 Feb; Vol. 26 (2), pp. 237-255. Date of Electronic Publication: 2020 Nov 27.
DOI: 10.1111/tmi.13521
Abstrakt: 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.
(© 2020 John Wiley & Sons Ltd.)
Databáze: MEDLINE
Externí odkaz: