Assessment of the anti-feeding and insecticidal effects of the combination of dinotefuran, permethrin and pyriproxyfen (Vectra((R)) 3D) against Triatoma infestans on rats

authors

  • Tahir D.
  • Davoust B.
  • Varloud M.
  • Berenger J. -M.
  • Raoult Didier
  • Almeras L.
  • Parola P.

keywords

  • Triatoma infestans
  • Trypanosoma cruzi
  • Ectoparasiticide
  • Efficacy
  • Rat model

document type

ART

abstract

This study, based on the rat model, was designed to explore the anti-feeding and insecticidal efficacy of a topical ectoparasiticide, dinotefuran-permethrin-pyriproxyfen (DPP), against Triatoma infestans (Hemiptera: Reduviidae), a vector of Trypanosoma cruzi (Trypanosomatida: Trypanosomatidae), for which dogs are domestic reservoir hosts. Twenty rats were divided into two equal groups: untreated and treated. Each rat was exposed under sedation to 16 T.infestans of mixed life stages for 1h on days 1, 7, 14, 21 and 28 post-treatment. The anti-feeding and insecticidal effects of DPP were estimated after 1h of exposure. Insecticidal efficacy was also assessed after incubation of the insects for 24h post-exposure. Anti-feeding efficacy was 96.7, 84.7, 80.5, 81.5 and 42.6% on days 1, 7, 14, 21 and 28, respectively. Insecticidal efficacy evaluated at 1 and 24h after exposure on days 1, 7, 14, 21 and 28 was 100, 91.2, 82.5, 80.0 and 29.1, and 100, 100, 100, 96.0 and 49.9%, respectively. This study demonstrates that a single administration of DPP spot-on treatment at a dose equivalent to the minimal recommended dose in rats has a powerful effect against T.infestans starting from day1 that lasts for at least 3weeks.

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