Prevalence of and potential risk factors for multiple resistance to acaricides in Rhipicephalus (Boophilus) microplus ticks: A survey in the state of Rio Grande Do Sul, Brazil.

Autor: Ferreira PT; Departamento de Diagnóstico e Pesquisa Agropecuária, Instituto de Pesquisas Veterinárias Desidério Finamor (IPVDF), Eldorado do Sul, Brazil., Bidone NB; Departamento de Defesa Sanitária Animal, Secretaria de Agricultura, Pecuária, Produção Sustentável e Irrigação (SEAPI) do Rio Grande do Sul, Porto Alegre, Brazil., Groff F; Departamento de Defesa Sanitária Animal, Secretaria de Agricultura, Pecuária, Produção Sustentável e Irrigação (SEAPI) do Rio Grande do Sul, Porto Alegre, Brazil., da Silva PS; Departamento de Diagnóstico e Pesquisa Agropecuária, Instituto de Pesquisas Veterinárias Desidério Finamor (IPVDF), Eldorado do Sul, Brazil., de Jesus MS; Departamento de Diagnóstico e Pesquisa Agropecuária, Instituto de Pesquisas Veterinárias Desidério Finamor (IPVDF), Eldorado do Sul, Brazil., Pellegrini DDCP; Centro de Ciências da Saúde Animal, Universidade Federal do Pampa (UNIPAMPA), Uruguaiana, Brazil., Doyle RL; Departamento de Diagnóstico e Pesquisa Agropecuária, Instituto de Pesquisas Veterinárias Desidério Finamor (IPVDF), Eldorado do Sul, Brazil., Reck J; Departamento de Diagnóstico e Pesquisa Agropecuária, Instituto de Pesquisas Veterinárias Desidério Finamor (IPVDF), Eldorado do Sul, Brazil., Klafke G; Departamento de Diagnóstico e Pesquisa Agropecuária, Instituto de Pesquisas Veterinárias Desidério Finamor (IPVDF), Eldorado do Sul, Brazil.
Jazyk: angličtina
Zdroj: Medical and veterinary entomology [Med Vet Entomol] 2024 Oct 15. Date of Electronic Publication: 2024 Oct 15.
DOI: 10.1111/mve.12767
Abstrakt: The cattle tick Rhipicephalus (Boophilus) microplus (Canestrini, 1887) (Ixodida, Ixodidae) is responsible for significant economic losses in bovine production in tropical and subtropical regions worldwide. Control of this tick predominantly involves the use of chemical acaricides; however, their indiscriminate use has led to the selection of resistant populations. A survey on tick populations was conducted in the state of Rio Grande do Sul, in Brazil, to assess the prevalence of multiple resistance to acaricides in cattle farms. Additionally, questionnaires were administered to identify potential risk factors associated with multiple resistance to acaricides. In total, 176 farms with a bovine population of ≥40 cattle were randomly assigned for tick sampling. The resistance to six acaricidal compounds was investigated by bioassays. A larval packet test was performed for amitraz, chlorpyrifos, cypermethrin, fipronil and ivermectin. Fluazuron was screened using an adult immersion test. Multiple resistance to acaricides (i.e., resistance to three or more compounds) was detected in 173 samples, representing 98% of the total samples. Among these samples, 125 (71%) showed resistance to all six compounds tested. Additionally, we classified the resistance intensity into four levels (I to IV) based on the quartile distribution of the bioassay data. Ten samples (6%) showed high and very high levels (III and IV) of resistance to all six compounds tested. Three variables were significantly associated with multiple resistance to the six acaricides tested: (i) use of injectable acaricides to control ticks, (ii) application of more than five acaricide treatments per year, and (iii) farms with larger herds (≥232 animals). These results regarding widespread resistance and the emergence of multiple resistance to acaricides ticks are alarming and highlight the significant challenge of tick control in southern Brazil.
(© 2024 Royal Entomological Society.)
Databáze: MEDLINE
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