A mapping of Rhipicephalus microplus resistance to acaricides in the littoral region of Argentina

IF 1.4 Q3 PARASITOLOGY

Veterinary parasitology, regional studies and reports Pub Date : 2025-09-11 DOI:10.1016/j.vprsr.2025.101344

Jorgelina Torrents , Macarena Sarli , Maria V. Rossner , Nicolás Morel , Santiago Nava

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Abstract

The aim of this work was to perform an analysis of the geographical dispersion of Rhipicephalus microplus resistance to acaricides in the littoral region of Argentina, which is the most favorable area for the development of this tick in the Argentinean territory. The data were obtained through the application of in vitro bioassays. Larval immersion test (LIT) were the bioassays used to detect resistance to ivermectin and fipronil, while adult immersion tests (AIT) were employed for the diagnosis of resistance to pyrethroids, amitraz and the combinations of cypermethrin with organophosphates. Cases of resistance to ivermectin were determined in localities from all the provinces of the littoral region (except for Formosa province). Samples from Corrientes, Entre Rios, and Santa Fe provinces were also determined as resistant to fipronil. Resistance to cypermethrin was a common result for all the tested samples. Samples from Corrientes and Santa Fe provinces were determined as resistant to amitraz and to the combinations of cypermethrin with organophosphates, and samples from Entre Rios province were diagnosed as resistant to amitraz. Muti-resistant population of R. microplus were detected in three provinces. The widespread dissemination of R. microplus resistance to acaricides in the littoral region of Argentina may be associated with a high frequency of annual chemical treatments, which is a consequence of different factors as ecological conditions very favorable to R. microplus, the free movement of cattle without mandatory tick control between farms within the tick infested area, and the presence of cattle breeds susceptible to tick infestation.

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阿根廷沿海地区微头虫对杀螨剂的抗性图谱

本研究的目的是分析阿根廷沿海地区微头蜱对杀螨剂抗性的地理分布，该地区是阿根廷境内微头蜱最有利的发展地区。这些数据是通过体外生物测定法获得的。对伊维菌素和氟虫腈的抗性检测采用幼虫浸渍法，对拟除虫菊酯、阿米特嗪和氯氰菊酯与有机磷混用的抗性检测采用成虫浸渍法。在沿海地区所有省份（除福尔摩沙省外）的地方均检测到伊维菌素耐药病例。来自科连特斯省、恩特里奥斯省和圣达菲省的样本也被确定对氟虫腈具有抗药性。对氯氰菊酯的抗性是所有测试样本的共同结果。科伦特斯省和圣达菲省的样本被确定为对氨吡虫啉和氯氰菊酯与有机磷的组合耐药，恩特雷里奥斯省的样本被诊断为对氨吡虫啉耐药。在3个省均检测到多耐药种群。阿根廷沿海地区对杀螨剂有抗药性的小圆蝽的广泛传播可能与每年化学处理的频率高有关，这是多种因素的结果，如生态条件非常有利于小圆蝽，牛在蜱虫出没地区的农场之间自由移动而没有强制控制蜱虫，以及存在易受蜱虫侵害的牛品种。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Veterinary parasitology, regional studies and reports Multiple-

CiteScore

2.90

自引率

7.10%

发文量

126

审稿时长

97 days

期刊介绍： Veterinary Parasitology: Regional Studies and Reports focuses on aspects of veterinary parasitology that are of regional concern, which is especially important in this era of climate change and the rapid and often unconstrained travel of people and animals. Relative to regions, this journal will accept papers of the highest quality dealing with all aspects of disease prevention, pathology, treatment, epidemiology, and control of parasites within the field of veterinary medicine. Also, case reports will be considered as they add to information related to local disease and its control; such papers must be concise and represent appropriate medical intervention. Papers on veterinary parasitology from wildlife species are acceptable, but only if they relate to the practice of veterinary medicine. Studies on vector-borne bacterial and viral agents are suitable, but only if the paper deals with vector transmission of these organisms to domesticated animals. Studies dealing with parasite control by means of natural products, both in vivo and in vitro, are more suited for one of the many journals that now specialize in papers of this type. However, due to the regional nature of much of this research, submissions may be considered based upon a case being made by the author(s) to the Editor. Circumstances relating to animal experimentation must meet the International Guiding Principles for Biomedical Research Involving Animals as issued by the Council for International Organizations of Medical Sciences (obtainable from: Executive Secretary C.I.O.M.S., c/o W.H.O., Via Appia, CH-1211 Geneva 27, Switzerland).