CONICET | Buscador de Institutos y Recursos Humanos

So far dengue has only affected the north of Argentina, being Salta the most affected province.However, the 2009 outbreak, with 5 deaths and more than 27,000 infected, was the most important, and the first outbreak to extend into the central area of the country. This paper includes: research on seasonal Ae. aegypti abundance variation in Orán City (Salta province); determination of the date of increase in mosquito population and an estimation of the date of the maximum rate of increase as well as the intrinsic rate of natural increase in order to detect the optimal time to apply vector control measures. Between September 2005 and March 2007, ovitraps were randomly distributed in the city to collect Ae.aegypti eggs. The variation observed in the number of collected eggs was described by adjusting a third-grade polynomial by the least square method which allowed to determine the time when population increase began (week 1), after the temperate and dry season. Eggs were collected throughout the year, with a high variation in abundance, being highest during the warm and rainy season, and the maximum value registered in February 2007. The rate of increase of the number of eggs laid per week peaked between weeks 9 and 10 after the beginning of the population increase (week 1). Peak abundance of eggs during the 2005-2006 period, was recorded on week 15, with week 1 on February, and 7,967 eggs. During the 2006-2007 period, the peak was observed on week 22 (February) with 14,099 eggs. Estimation of the intrinsic rate of natural increase of Ae. Aegypti is useful not only to determine the optimal time to apply vector control measures with better cost-benefit, but also to add an insecticide control strategy against the vector to thus diminish the possibility of resistance.

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