Surveillance of the chikungunya vector Aedes albopictus (Skuse) in Emilia-Romagna (northern Italy): Organizational and technical aspects of a large scale monitoring system
Autor(es): Carrieri Marco, Albieri Alessandro, Angelini Paola, Baldacchini Flavia, Venturelli Claudio, Zeo Silvia Mascali, Bellini Romeo
Resumo: The chikungunya virus outbreak that occurred in 2007 in northern Italy (Emilia-Romagna region) prompted the development of a large scale monitoring system of the population density of Aedes albopictus (Skuse, 1894), comparable at the provincial - municipal levels. In 2007, egg density data presented an aggregated distribution (VMR >1) - Taylor's power law was applied to calculate the minimum number of ovitraps needed to obtain the prefixed precision levels: D=0.2 in the areas where the chikungunya epidemic occurred - D=0.3 in all the other urban areas >600 ha. The estimated minimum ovitrap number was then used to set up a monitoring network at the regional scale in season 2008 (May-October). In 242 municipalities 2,741 ovitraps were activated - the 2008 sampled data showed a similar aggregated distribution as in 2007. The adequacy of the monitoring design was evaluated by recalculating the Taylor's coefficients - the minimum ovitrap number for each urban area >600 ha using the 2008 egg density data. The comparison between the two estimates showed that the minimum ovitrap number calculated in 2007 was underestimated by 2.7% in weeks 22-41 but was overestimated by 29.4% if referring to the period of highest population density (weeks 27-37). The low cost of the proposed monitoring system, based on the use of fortnightly checked ovitraps, could make it economically sustainable even in a non-epidemic season.
Imprenta: Journal of Vector Ecology, v. 36, n. 1, p. 108-116, 2011
Identificador do objeto digital: 10.1111/j.1948-7134.2011.00147.x
Descritores: Chikungunya virus - Pathogenesis ; Chikungunya Virus - Virus ; Chikungunya virus - Epidemic ; Chikungunya virus - Public health
Data de publicação: 2011
