The objectives of the present study were: (i) to identify the frequency of cattle farms with a cohabitation of Amblyomma cajennense and Rhipicephalus microplus, (ii) to determine the status of susceptibility or resistance to acaricides used in Veracruz, Mexico, on A. cajennense populations and (iii) to identify factors associated with A. cajennense resistant to acaricides. Fifty farms were visited to determine the presence of ticks (A. cajennense and R. microplus) and to collect engorged A. cajennense individuals. From these, 24 A. cajennense populations were evaluated in resistance bioassays using discriminating doses of acaricides. The acaricides tested were organophosphates (chlorpiriphos, coumaphos and diazinon), pyrethroids (flumethrin, deltamethrin and cypermethrin), amidines (amitraz) and fipronil (a broad spectrum N-phenylpyrazole insecticide). A. cajennense infesting bovines were identified in 86% (43/50) of the farms visited, and 100% of the farms sampled (43/43) had cohabitation between R. microplus and A. cajennense. Of the farm owners or managers surveyed, 87.5% could not distinguish the morphological difference between tick genera. Populations of A. cajennense were 100%, 91.7% and 12.5% resistant to diazinon, coumaphos and chlorpyriphos (organophosphates), respectively, and 12.5% to amitraz, as were those susceptible to flumethrin and fipronil. In conclusions, populations of A. cajennense showed a high frequency of resistance to the organophosphates tested and to amitraz. Factors associated with the resistance to acaricides in A. cajennense were not identified.
Download full-text PDF |
Source |
|---|---|
| http://dx.doi.org/10.1016/j.vetpar.2013.06.004 | DOI Listing |
Publication Analysis
Top Keywords
Similar Publications
Therapeutic effect of GP543 strain of Bacillus thuringiensis against Amblyomma cajennense ticks in vitro and in naturally infested cattle.
Parasitol Res
December 2024
Facultad de Ciencias Agropecuarias, Universidad Autónoma del Estado de Morelos, Av. Universidad 1001, Chamilpa, 62209, Cuernavaca, Morelos, Mexico.
The current study was focused on evaluating the in vitro effect of the spore-crystal complex of GP543 Bacillus thuringiensis strain on the viability of Amblyomma cajennense, and the in vivo reduction of the parasite load of this ectoparasite on naturally infested cattle. In vitro, 30 adult ticks were treated with 1.2 mg/ml of B.
View Article and Find Full Text PDFDog ectoparasites as sentinels for pathogenic Rickettsia and Bartonella in rural Guatemala.
Acta Trop
December 2024
Department of Veterinary Integrative Biosciences, College Station, Texas, USA. Electronic address:
Article Synopsis
- Fleas and ticks are carriers of pathogens like Rickettsia and Bartonella, which can cause diseases in humans and animals, yet little research exists on this in Guatemala.
- The research involved collecting and analyzing fleas and ticks from dogs in rural Guatemala, revealing that a significant number of dogs were infested with these parasites.
- The study identified new strains of Rickettsia and Bartonella in Guatemala, highlighting the potential zoonotic disease risk and demonstrating the importance of dogs in understanding human exposure to these pathogens.
Impact of climate change on the geographical distribution of ticks of public health significance in Colombia: Amblyomma ovale (Ixodida: Ixodidae), the Amblyomma maculatum (Ixodida: Ixodidae) complex and the Amblyomma cajennense (Ixodida: Ixodidae) complex.
J Med Entomol
November 2024
Universidad Nacional de Colombia, Grupo Parasitología Veterinaria, Bogotá, Colombia.
Article Synopsis
- Ticks from the Amblyomma genus in Colombia, including the complexes A. maculatum, A. cajennense, and A. ovale, are known to transmit Rickettsia species, but their distribution is not fully understood.
- Predictive models showed that A. ovale and A. maculatum may expand their range by 2070, while A. mixtum and A. patinoi might see a decrease in their distribution; factors like temperature and rainfall significantly influence these changes.
- Ongoing surveillance is essential to study the potential spread of rickettsiosis related to different Rickettsia species across these tick populations and their environments.
Background: Fleas and ticks serve as vectors of multiple pathogens in the genera and cause diseases in humans and other animals. Although human rickettsiosis and bartonellosis have been reported in all countries in Central America, limited research has been conducted to investigate the natural cycles of flea- and tick-borne rickettsiosis and bartonellosis, especially in Guatemala.
Methods: We evaluated dog parasites as sentinels for zoonotic disease risk in rural Guatemala by sampling ticks and fleas from dogs, which were then identified and individually screened for and .
Ticks parasitizing cold-blooded animals from three different Brazilian biomes; with note for males of Amblyomma rotundatum.
Ticks Tick Borne Dis
November 2024
Department of Preventive Veterinary Medicine and Animal Health, Faculty of Veterinary Medicine and Animal Science, University of São Paulo, São Paulo, SP 05508-270, Brazil; São Paulo State Department of Health, Pasteur Institute, São Paulo, SP 05402-000, Brazil.
Ticks parasitize a wide variety of wild animals, including amphibians and reptiles. In addition to the possibility of microorganism transmission to these hosts, ticks can also cause severe bleeding, and high parasitism can lead to death. Therefore, knowing the diversity of ticks parasitizing amphibians and reptiles is important for conservation and preservation measures for these vertebrates.
View Article and Find Full Text PDFWant AI Summaries of new PubMed Abstracts delivered to your In-box?
Enter search terms and have AI summaries delivered each week - change queries or unsubscribe any time!