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Susceptibility of Aedes aegypti populations to pyriproxyfen in the Federal District of Brazil
Carvalho, Bruno Lopes; Germano, Rayssa Nádia Leite; Braga, Kátia Maria Leal; Araújo, Evaldo Rosano Ferreira de; Rocha, Douglas de Almeida; Obara, Marcos Takashi.
  • Carvalho, Bruno Lopes; Universidade de Brasília. Programa de Pós-Graduação Stricto Sensu em Medicina Tropical. Brasília. BR
  • Germano, Rayssa Nádia Leite; Ministério da Saúde. Secretaria de Vigilância em Saúde. Laboratório de Entomologia Médica. Brasília. BR
  • Braga, Kátia Maria Leal; Ministério da Saúde. Secretaria de Vigilância em Saúde. Laboratório de Entomologia Médica. Brasília. BR
  • Araújo, Evaldo Rosano Ferreira de; Ministério da Saúde. Secretaria de Vigilância em Saúde. Laboratório de Entomologia Médica. Brasília. BR
  • Rocha, Douglas de Almeida; Universidade de Brasília. Programa de Pós-Graduação Stricto Sensu em Medicina Tropical. Brasília. BR
  • Obara, Marcos Takashi; Universidade de Brasília. Laboratório de Parasitologia e Biologia de Vetores. Programa de Pós-Graduação Stricto Sensu em Medicina Tropical. Brasília. BR
Rev. Soc. Bras. Med. Trop ; 53: e20190489, 2020. tab, graf
Article in English | LILACS | ID: biblio-1057274
ABSTRACT
Abstract

INTRODUCTION:

In Brasilia, pyriproxyfen (PPF; 0.01 mg/L) has been used for the larval control of Aedes aegypti mosquitoes since 2016. Information on the susceptibility of Ae. aegypti to PPF, and the development of resistance in populations from the Federal District of Brazil (FD) is limited. It is essential to monitor the susceptibility of Ae. aegypti to insecticides in order to improve vector control strategies. This study aimed to evaluate the susceptibility of Ae. aegypti populations from five areas of Brasilia to PPF.

METHODS:

We performed dose-response tests to estimate the emergence inhibition and resistance ratio of each field population, including the Rockefeller reference population. We also analyzed egg positivity, and the density and mortality of larvae and pupae.

RESULTS:

Populations from Vila Planalto (RR50=1.7), Regiment Guards Cavalry (RR50=2.5), and Sub-secretary of Justice Complex (RR50=3.7) presented high susceptibility to PPF, while the RR values of populations from Lago Norte (RR50=7.7) and Varjão (RR50=5.9) were moderately high, suggesting the emergence of insipient resistance to PPF in Brasilia. At 30 ng/mL, the highest larvae mortality rate was 2.7% for the population from Lago Norte, while that of pupae was 92.1% for Varjão and Vila Planalto.

CONCLUSIONS:

The five populations of Ae. aegypti from the FD are susceptible to PPF and there is a need to monitor the susceptibility of Ae. aegypti in new areas of the FD.
Subject(s)


Full text: Available Index: LILACS (Americas) Main subject: Pyridines / Insecticide Resistance / Aedes / Mosquito Vectors / Insecticides Limits: Animals Country/Region as subject: South America / Brazil Language: English Journal: Rev. Soc. Bras. Med. Trop Journal subject: Tropical Medicine Year: 2020 Type: Article Affiliation country: Brazil Institution/Affiliation country: Ministério da Saúde/BR / Universidade de Brasília/BR

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Full text: Available Index: LILACS (Americas) Main subject: Pyridines / Insecticide Resistance / Aedes / Mosquito Vectors / Insecticides Limits: Animals Country/Region as subject: South America / Brazil Language: English Journal: Rev. Soc. Bras. Med. Trop Journal subject: Tropical Medicine Year: 2020 Type: Article Affiliation country: Brazil Institution/Affiliation country: Ministério da Saúde/BR / Universidade de Brasília/BR