{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,9,22]],"date-time":"2026-09-22T17:40:53Z","timestamp":1790098853007,"version":"4.0.1"},"reference-count":45,"publisher":"Wiley","issue":"1","license":[{"start":{"date-parts":[[2024,10,15]],"date-time":"2024-10-15T00:00:00Z","timestamp":1728950400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"funder":[{"DOI":"10.13039\/501100002322","name":"Coordena\u00e7\u00e3o de Aperfei\u00e7oamento de Pessoal de N\u00edvel Superior","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100002322","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100003593","name":"Conselho Nacional de Desenvolvimento Cient\u00edfico e Tecnol\u00f3gico","doi-asserted-by":"publisher","id":[{"id":"10.13039\/501100003593","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":["resjournals.onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Medical Vet Entomology"],"published-print":{"date-parts":[[2025,3]]},"abstract":"<jats:title>Abstract<\/jats:title>\n                  <jats:p>\n                    The cattle tick\n                    <jats:italic>Rhipicephalus (Boophilus) microplus<\/jats:italic>\n                    (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 \u226540 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 (\u2265232 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.\n                  <\/jats:p>","DOI":"10.1111\/mve.12767","type":"journal-article","created":{"date-parts":[[2024,10,15]],"date-time":"2024-10-15T09:33:26Z","timestamp":1728984806000},"page":"134-145","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":22,"title":["<scp>Prevalence of and potential risk factors for multiple resistance to acaricides in<\/scp>\n                    <i>Rhipicephalus (Boophilus) microplus<\/i>\n                    <scp>ticks<\/scp>\n                    : A\n                    <scp>survey in the state of Rio Grande Do Sul<\/scp>\n                    ,\n                    <scp>Brazil<\/scp>"],"prefix":"10.1111","volume":"39","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9069-8072","authenticated-orcid":false,"given":"Priscila Teixeira","family":"Ferreira","sequence":"first","affiliation":[{"name":"Departamento de Diagn\u00f3stico e Pesquisa Agropecu\u00e1ria Instituto de Pesquisas Veterin\u00e1rias Desid\u00e9rio Finamor (IPVDF)  Eldorado do Sul Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Nathalia de Bem","family":"Bidone","sequence":"additional","affiliation":[{"name":"Departamento de Defesa Sanit\u00e1ria Animal Secretaria de Agricultura, Pecu\u00e1ria, Produ\u00e7\u00e3o Sustent\u00e1vel e Irriga\u00e7\u00e3o (SEAPI) do Rio Grande do Sul  Porto Alegre Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Fernando","family":"Groff","sequence":"additional","affiliation":[{"name":"Departamento de Defesa Sanit\u00e1ria Animal Secretaria de Agricultura, Pecu\u00e1ria, Produ\u00e7\u00e3o Sustent\u00e1vel e Irriga\u00e7\u00e3o (SEAPI) do Rio Grande do Sul  Porto Alegre Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Patr\u00edcia Silva","family":"da Silva","sequence":"additional","affiliation":[{"name":"Departamento de Diagn\u00f3stico e Pesquisa Agropecu\u00e1ria Instituto de Pesquisas Veterin\u00e1rias Desid\u00e9rio Finamor (IPVDF)  Eldorado do Sul Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Mariana Silveira","family":"de Jesus","sequence":"additional","affiliation":[{"name":"Departamento de Diagn\u00f3stico e Pesquisa Agropecu\u00e1ria Instituto de Pesquisas Veterin\u00e1rias Desid\u00e9rio Finamor (IPVDF)  Eldorado do Sul Brazil"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Debora da Cruz Payao","family":"Pellegrini","sequence":"additional","affiliation":[{"name":"Centro de Ci\u00eancias da Sa\u00fade Animal Universidade Federal do Pampa (UNIPAMPA)  Uruguaiana 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