INVESTIGADORES
ESTALLO Elizabet Lilia
artículos
Título:
Prevention of Dengue outbreaks through Aedes aegypti oviposition activity forecasting method
Autor/es:
ESTALLO EL; LUDUEÑA-ALMEIDA F; VISINTIN A; SCAVUZZO M; INTROINI MV; ZAIDENBERG M; ALMIRÓN WR
Revista:
VECTOR-BORNE AND ZOONOTIC DISEASES
Editorial:
MARY ANN LIEBERT INC
Referencias:
Lugar: New York; Año: 2011 vol. 11 p. 543 - 549
ISSN:
1530-3667
Resumen:
In Argentina, dengue has affected the north of the country, mainly Salta province. The 2009 outbreak, with 5 deaths and more than 27,000 infected, was the most important, and the first 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 mosquito population increase and an estimation of the date of maximum rate of increase as well as the intrinsic rate of natural increase (r), to detect the optimal time to apply vector control measures. Between September 2005-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 fitting a third degree polynomial by the least square method, allowing to determine the time when population increase began (week 1), after the temperate and dry season. Eggs were collected throughout the year, with the highest variation in abundance 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). Week 1 depends on temperature, it occurs after getting over the thermal threshold and the needed accumulation of 160 degree-day is reached. Consequently week 1 changes depending on temperature. Peak abundance of eggs during 2005-2006 period, was recorded on week 15 (after week 1), and during 2006-2007 period, the peak was observed on week 22. Estimation of the intrinsic rate of natural increase (r) of Ae. aegypti is useful not only to determine optimal time to apply vector control measures with better cost-benefit, but to add an insecticide control strategy against the vector to diminish the possibility of resistance.