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Aedes (= Stegomyia) aegypti is the main vector of dengue in the Americas, and it is also a vector of urban yellow fever. This mosquito species has a global distribution, ranging from tropical and subtropical through temperate regions. Its continuously expanding distribution may be a critical factor in the constant increase in the incidence and geographic range of dengue (Gubler 2004). After the continental-wide control program during the twentieth century, Ae. aegypti was eradicated from Argentina and its neighboring countries in 1965 (Soper 1967). However, this species was detected again in the Misiones and Formosa provinces of Argentina in 1986 (OMS 1990). In 1991, Ae. aegypti reached the temperate region of this country, where it was detected in the locality of Quilmes, Buenos Aires province (Campos 1993), and in 1995 it reached various neighborhoods of Buenos Aires city for the first time (Junín et al. 1995 …