Toxicity of spinosad to temephos-resistant Aedes aegypti populations in Brazil.

The mosquito Aedes aegypti is the primary vector of different arboviruses and represents a major public health problem. Several Brazilian populations of Ae. aegypti have developed resistance to temephos, the most used organophosphate larvicide.

[Monitoring the susceptibility of Triatoma sordida Stål, 1859 (Hemiptera: Reduviidae) to deltamethrin insecticide, in Central-Western Brazil].

Introduction: Triatoma sordida Stål, 1859 populations were investigated for susceptibility to deltamethrin.

Methods: This study aimed to analyze the resistance of 11 populations of insects from the States of Goiás, Mato Grosso and Mato Grosso do Sul by topical application bioassays.

Results: The estimated LD50 and RR50 showed high levels of susceptibility (LD50 < 1 and RR50 < 2).

Association of insecticide use and alteration on Aedes aegypti susceptibility status.

Dengue and dengue hemorrhagic fever, vector-borne diseases transmitted by the mosquito Aedes aegypti, are presently important public health problems in Brazil. As the strategy for disease control is based on vector control through the use of insecticides, the development of resistance is a threat to programs efficacy. The objective of this study was to compare the Aedes aegypti susceptibility in nine vector populations from the state of São Paulo and seven from Northeast region of Brazil, since there was a difference on group of insecticide used between the areas.