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  • Title: Impact of 4% Deltamethrin-Impregnated Dog Collars on the Prevalence and Incidence of Canine Visceral Leishmaniasis.
    Author: Kazimoto TA, Amora SSA, Figueiredo FB, Magalhães JME, Freitas YBN, Sousa MLR, Melo AECDS, Campos MP, Alves ND, Werneck GL.
    Journal: Vector Borne Zoonotic Dis; 2018 Jul; 18(7):356-363. PubMed ID: 29683394.
    Abstract:
    In Brazil, visceral leishmaniasis is caused by the protozoan Leishmania infantum, primarily transmitted by Lutzomyia longipalpis and with the dog as its main urban reservoir. This study aims to evaluate the effectiveness of 4% deltamethrin-impregnated dog collars (DMC) DIC, Scalibor® 65 cm model and MSD manufacturer, on the prevalence and incidence of canine visceral leishmaniasis (CVL) and on the rate of infection of sandflies by L. infantum. The research was conducted in two areas of the municipality Mossoró, State of Rio Grande do Norte in Northeast of Brazil. Two semiannual serosurveys, followed by culling seropositive dogs, and searches for phlebotominae were performed in the control area (CA), whereas in the collar intervention area (IA), aside from those procedures, DMC were fitted to dogs every 6 months. CVL was diagnosed by the Dual Path Platform rapid test (TR-DPP®) and the Immunoenzymatic assay (EIE). The sandflies were collected monthly, identified, and the females were submitted to Quantitative Real-Time Polymerase Chain Reaction for detection of L. infantum DNA. The use of collars was associated with a 53-59% reduction in the incidence of CVL. The most abundant phlebotomine species were L. longipalpis (81.8%). Positive pools of L. longipalpis were obtained in the IA only in the first survey, whereas the presence of the DNA of the parasite in the vector was observed in the CA in both surveys. We conclude that the continuous use of these collars may have the potential to reduce both the incidence of CVL and the rate of infected phlebotomine sandflies.
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