Multiple acaricide-resistant Rhipicephalus microplus in the semi-arid region of Paraíba State, Brazil

Vilela, Vinícius Longo Ribeiro; Feitosa, Thaís Ferreira; Bezerra, Roberto Alves; Klafke, Guilherme Marcondes; Riet-Correa, Franklin

doi:10.1016/j.ttbdis.2020.101413

Cited by 27 publications

(10 citation statements)

References 45 publications

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“…This result of 100% of resistance / incipient resistance to fipronil is the opposite observed in a study conducted in the semi-arid region of Paraíba State, Brazil, in which the same LIT methodology was employed, however, all 22 samples evaluated were susceptible (Vilela et al, 2020). According to these authors, fipronil is still little used in cattle in the semi-arid region of Paraíba State, therefore, the greater use of this molecule on farms in Mato Grosso do Sul could justify this difference in susceptibility profile.…”

Section: /7contrasting

confidence: 56%

Status of Rhipicephalus microplus resistance to ivermectin, fipronil and fluazuron in Mato Grosso do Sul, Brazil

Valsoni

Freitas

Borges

et al. 2021

Rev. Bras. Parasitol. Vet.

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Southern cattle tick resistance to pour-on and injectable acaricides has yet to be evaluated on a broader scope, and the paucity of information on the subject may hinder efforts to control this parasite. The objective of this study was to evaluate the resistance profile of ten populations of Rhipicephalus microplus to the acaricides fluazuron, fipronil and ivermectin in cattle herds in Mato Grosso do Sul, Brazil. The larval immersion test (LIT) was used to evaluate susceptibility to ivermectin and fipronil and the adult immersion test (AIT) was performed to evaluate fluazuron. Samples were randomly obtained in ten farms, and in general, we found resistance in five samples to fluazuron and in four samples to ivermectin and fipronil. Six samples showed incipient resistance to ivermectin and fipronil. Five of the ten evaluated samples showed resistance and/or incipient resistance to all the active ingredients, and the other five to two active ingredients. Among the samples classified as resistant, the average resistance ratio for ivermectin was 2.75 and 3.26 for fipronil. These results demonstrate the advanced status of resistance to the most modern chemical groups for the control of R. microplus in the state of Mato Grosso do Sul.

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Section: /7contrasting

confidence: 56%

Status of Rhipicephalus microplus resistance to ivermectin, fipronil and fluazuron in Mato Grosso do Sul, Brazil

Valsoni

Freitas

Borges

et al. 2021

Rev. Bras. Parasitol. Vet.

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“…Therefore, it is exposed to acaricide longer and has become resistant worldwide to almost all classes of chemicals. These ticks are reported as resistant to acaricide drugs [80][81][82][83][84][85][86][87][88][89][90][91] and multidrug resistant strains have been reported, also [92,93].…”

Section: Ticksmentioning

confidence: 99%

Entomopathogenic Fungi and Bacteria in a Veterinary Perspective

Ebani

Mancianti

2021

Biology

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The present study aimed to review the papers dealing with the biological activity of fungi and bacteria against some mites and ticks of veterinary interest. In particular, the attention was turned to the research regarding acarid species, Dermanyssus gallinae and Psoroptes sp., which are the cause of severe threat in farm animals and, regarding ticks, also pets. Their impact on animal and human health has been stressed, examining the weaknesses and strengths of conventional treatments. Bacillus thuringiensis, Beauveria bassiana and Metarhizium anisopliae are the most widely employed agents. Their activities have been reviewed, considering the feasibility of an in-field application and the effectiveness of the administration alone or combined with conventional and alternative drugs is reported.

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“…The rst report of resistance to ivermectin in the tick R. microplus (São Gabriel strain) in Brazil was described by Martins and Furlong (2001). Since then, several studies have shown the occurrence of this resistance in different locations (Klafke et al, 2006;Andreotti, 2010;Lopes et al, 2013;Vilela et al, 2020). In addition, Martins and Furlong (2001) reported cross-resistance between doramectin, moxidectin and ivermectin in studies carried out with the São Gabriel strain.…”

Section: Introductionmentioning

confidence: 99%

“…That is why the effective control of this ectoparasite is of utmost concern. R. microplus populations have developed resistance to all acaricides available on the market (Rodriguez-Vivas et al, 2014; Reck et al, 2014;Villar et al, 2020;Vilela et al, 2020;Valsoni et al, 2020;. The excessive use of acaricides in the absence of knowledge about the life cycle of the arthropod, allied to failures in its detection and mismanagement in animal husbandry, leads to the development of resistance to almost all classes of veterinary drugs on the market, and the more widely these acaricides are applied, the higher the percentage of drug resistance (Kumar et al, 2020;Villareal et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Cross-resistance between macrocyclic lactones in populations of Rhipicephalus microplus in Brazil’s semiarid region

et al. 2022

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Rhipicephalus microplus, also known as the cattle tick, is the parasite with the greatest impact on cattle in Brazil. The most common method for controlling this tick is the application of synthetic chemical acaricides, especially ivermectin, which belongs to the group of macrocyclic lactones (MLs). However, because ivermectin is widely used, there is concern about the development of cross-resistance within this chemical class. Thus, engorged females were collected from farms with a history of resistance to ivermectin, which was the only one among the MLs that was used as an anthelmintic drug. Using the larval immersion test (LIT) technique, bioassays were performed with ivermectin, moxidectin and eprinomectin on populations of R. microplus from the semiarid region of the states of Paraíba and Ceará. Epidemiological questionnaires were applied to collect information about tick control management. All the evaluated populations showed cross-resistance between ivermectin and moxidectin, but only one population showed cross-resistance between ivermectin and eprinomectin. Weekly or monthly administration of injectable 1% ivermectin on farms was reported. It was concluded that the frequent use of ivermectin may lead to the development of cross-resistance to moxidectin. For eprinomectin, despite the structural similarity, cross-resistance was not observed in three tick populations.

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Multiple acaricide-resistant Rhipicephalus microplus in the semi-arid region of Paraíba State, Brazil

Cited by 27 publications

References 45 publications

Status of Rhipicephalus microplus resistance to ivermectin, fipronil and fluazuron in Mato Grosso do Sul, Brazil

Status of Rhipicephalus microplus resistance to ivermectin, fipronil and fluazuron in Mato Grosso do Sul, Brazil

Entomopathogenic Fungi and Bacteria in a Veterinary Perspective

Cross-resistance between macrocyclic lactones in populations of Rhipicephalus microplus in Brazil’s semiarid region

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