In Argentina, more than 25,000 cases of dengue were reported in the summer of 2009, even in provinces where
the disease was formerly absent. We analysed the susceptibility levels to the larvicide temephos in seven populations
, the primary vector of dengue, collected during summer 2007/2008, using the susceptible Rockefeller
strain as a control. Although no control failures were observed during the experiment, a majority of the lethal
concentration and resistance ratio values indicate an incipient resistance. An integrative program to monitor the
resistance of Ae. aegypti to insecticides is needed in the country.