scholarly journals A survey of anthelmintic resistance on ten sheep farms in Mashonaland East Province, Zimbabwe : research communication

1997 ◽  
Vol 68 (4) ◽  
Author(s):  
S. Mukaratirwa ◽  
R. Charakupa ◽  
T. Hove
Keyword(s):  
Haemonchus Contortus ◽  
Anthelmintic Resistance ◽  
Anthelmintic Treatment ◽  
Nematode Parasite ◽  
Parasite Control ◽  
First Report ◽  
Research Communication ◽  
Reduction Test ◽  
Nematode Parasites ◽  
Faecal Egg Count

A survey to detect anthelmintic resistance in nematode parasites of sheep was conducted on 10 randomly-distributed farms in the Chivhu District, Mashonaland East Province, Zimbabwe. Before the survey, a questionnaire was circulated to the farmers concerning nematode parasite control. Results showed that parasite control using anthelmintic treatment was the only method practised and that the benzimidazoles were the most frequently used anthelmintic drugs. The faecal egg count reduction test was used to detect resistance. The anthelmintic groups tested were benzimidazoles, levamisole and ivermectin. Resistance to benzimidazoles was detected on 6 of 10 farms and levamisole resistance on 2 of 3 farms. Ivermectin resistance was not observed on the farms surveyed. Post-treatment larval cultures indicated that Haemonchus contortus survived administration of fenbendazole, albendazole, oxfendazole and levamisole. A Cooperia sp. strain resistant to albendazole was detected and this is the first report in Zimbabwe of a resistant parasite in this genus.

scholarly journals First report of multiple anthelmintic resistance in nematodes of sheep in Colombia

2016 ◽  
Vol 88 (1) ◽  
pp. 397-402 ◽  
Author(s):  
Carlos M.B. Gárcia ◽  
Lew K. Sprenger ◽  
Efraín B. Ortiz ◽  
Marcelo B. Molento
Keyword(s):  
Multidrug Resistance ◽  
Haemonchus Contortus ◽  
Anthelmintic Resistance ◽  
Gastrointestinal Nematodes ◽  
The Other ◽  
First Report ◽  
Reduction Test ◽  
Anthelmintic Efficacy ◽  
Faecal Egg Count ◽  
First Time

This study aimed to report the presence of parasites resistant to the most used anthelmintic drugs in sheep in Colombia. Four farms (denominated farm 1, 2, 3 and 4) were selected where the animals were not treated with anthelmintics for two months before the trial. Animals with faecal egg count (FEC) above 150 and of different ages were allocated into six groups, each consisting of at least 5 animals. The drugs and dosages used were: ivermectin 1% (0.2 mg/kg), albendazole 25% (5 mg/kg), fenbendazole 10% (5 mg/kg), levamisole 10% (5 mg/kg), and moxidectin 1% (0.2 mg/kg). Anthelmintic efficacy was determined by the FEC reduction test (FECRT) with a second sampling 14 days post-treatment. The efficacy of albendazole and fenbendazole at farm 1 was above 95%, which was different from the others farms. The FECRT indicated the presence of multidrug resistance in the other farms where no tested drugs showed activity higher than 79% (albendazole: 0 to 55%, fenbendazole: 51.4 to 76.6%, ivermectin: 67.3 to 93.1%, levamisole: 0 to 78.1%, and moxidectin: 49.2 to 64.1%).Haemonchus contortus was the predominant (96%) species, followed by a small presence of Trichostrongylus sp. (3%) andCooperia sp. (1%). Therefore, we report for the first time the existence of multiple anthelmintic resistance in gastrointestinal nematodes of sheep in Colombia.

scholarly journals Multispecific resistance of sheep trichostrongylids in Austria

Parasite ◽  
2021 ◽  
Vol 28 ◽  
pp. 50
Author(s):  
Florian Untersweg ◽  
Viktoria Ferner ◽  
Sandra Wiedermann ◽  
Marie Göller ◽  
Marion Hörl-Rannegger ◽  
...  
Keyword(s):  
Treatment Strategy ◽  
Anthelmintic Resistance ◽  
Communication Strategies ◽  
Anthelmintic Treatment ◽  
Parasite Control ◽  
Treatment Groups ◽  
Reduction Test ◽  
Faecal Egg Count ◽  
Efficient Communication ◽  
Flotac Technique

Anthelmintic overuse and failure to implement methods preventing the development and spread of anthelmintic resistance (AR) have led to an alarming increase of resistant ovine trichostrongylids worldwide. The aim of the present study was to determine whether the routine anthelmintic treatment strategy was effective, to obtain insights into the frequency of AR in trichostrongylids of sheep in Austria, and to determine the presence of different trichostrongylid genera. On 30 sheep farms, the faecal egg count reduction test (FECRT) was performed with the Mini-FLOTAC technique in two consecutive studies. In study 1, only fenbendazole and moxidectin were tested, while different compounds and products were used in study 2. Overall, 33 treatment groups were formed: 11 groups were treated with benzimidazoles (fenbendazole and albendazole), 2 groups with avermectins (ivermectin, doramectin), 18 groups with moxidectin, and two groups with monepantel. Reduced efficacy was detected in 64%, 100%, 28% and 50% of these groups, respectively. The most frequently detected genus in larval cultures was Haemonchus, which had been barely detected in Austria previously, followed by Trichostrongylus. Multispecific resistance of trichostrongylids in Austria seems to be on the rise and H. contortus was detected unexpectedly frequently in comparison to previous studies. There is an urgent need to develop efficient communication strategies aimed at improving the engagement of farmers and veterinarians in sustainable parasite control.

scholarly journals Detection of anthelmintic resistance in sheep and goat against fenbendazole by faecal egg count reduction test

2016 ◽  
Vol 41 (2) ◽  
pp. 463-466 ◽  
Author(s):  
Ramandeep Singh ◽  
M. S. Bal ◽  
L. D. Singla ◽  
Paramjit Kaur
Keyword(s):  
Anthelmintic Resistance ◽  
Reduction Test ◽  
Faecal Egg Count

scholarly journals Resistance of Haemonchus contortus to monepantel in sheep: first report in Espírito Santo, Brazil

2021 ◽  
Vol 30 (4) ◽  
Author(s):  
Marcus Vinicius Gonçalves Viana ◽  
Ygor Henrique da Silva ◽  
Isabella Vilhena Freire Martins ◽  
Fabio Barbour Scott
Keyword(s):  
Haemonchus Contortus ◽  
Anthelmintic Resistance ◽  
Control Group ◽  
Espírito Santo ◽  
First Report ◽  
The Past ◽  
Fecal Egg Count ◽  
History Of ◽  
Males And Females ◽  
Espirito Santo

Abstract The objective of this study was to provide the first report of resistance of Haemonchus contortus to monepantel in sheep in Espírito Santo. The study was conducted in a property with history of monepantel use since 2014 and register of low efficacy in studies conducted over the past few years with fecal egg count reduction test. Lambs born on the property (males and females aged approximately 100 days) were selected and after eggs per gram of feces (EPG) analysis on fecal samples, these were divided into two groups: a group treated with monepantel (2.5 mg / Kg) and a control group without anthelmintic treatment. Seven days later, the animals were euthanized to recover parasites from the gastrointestinal tract. The efficacy of the treatment was 61.35% against H. contortus, thus proving that anthelmintic resistance to monepantel was present.

scholarly journals Monitoring the avermectin and pyrantel resistance status of nematode parasites of horses in the Czech Republic

2018 ◽  
Vol 63 (No. 7) ◽  
pp. 299-305
Author(s):  
S. Bodecek ◽  
J. Svetlikova ◽  
K. Hargitaiova ◽  
Z. Kecerova ◽  
M. Mrackova
Keyword(s):  
Czech Republic ◽  
Anthelmintic Resistance ◽  
The Czech Republic ◽  
Nematode Parasites ◽  
Faecal Egg Count

The avermectin and pyrantel resistance of equine parasites was monitored on four farms in the Czech Republic in 2014. The aim of the testing was to investigate the anthelmintic resistance of cyathostomins and ascarids. One hundred and eighty-six horses were included in the test, 54 of which were infected by ascarids and 174 by cyathostomins. Faecal egg count reduction tests were used to assess anthelmintic resistance. The faecal egg count reduction for ascarids was within the range of 87.9% to 100% for avermectins and 100% for pyrantel embonate. Faecal egg count reduction for cyathostomins ranged from 99% to 100% for avermectins and 89.3% to 98.2% for pyrantel embonate.

scholarly journals Monitoring of anthelmintic resistance in small strongyles in the Czech Republic in the years 2006–2009

2013 ◽  
Vol 82 (3) ◽  
pp. 243-248
Author(s):  
Štěpán Bodeček ◽  
Eva Vavrouchová
Keyword(s):  
Czech Republic ◽  
Anthelmintic Resistance ◽  
Drug Resistant ◽  
The Czech Republic ◽  
Parascaris Equorum ◽  
Reduction Test ◽  
Anoplocephala Perfoliata ◽  
Faecal Egg Count ◽  
Pre Treatment ◽  
Strongyloides Westeri

The aim of the field study performed in 2006 was to investigate the occurrence and distribution of intestinal helminths in horses based on pre-treatment faecal egg counts. In total, 948 horses bred on 37 farms were tested. Thirty six (97.2%) farms tested were positive for cyathostomins; horses in 9 (24.3%), 6 (16.2%) and 1 (2.7%) different herds tested were positive for Parascaris equorum, Anoplocephala perfoliata and Strongyloides westeri, respectively. In 21 herds, 344 horses with values exceeding 100 eggs per gram were included in the trial for the presence of drug resistant cyathostomins by a faecal egg count reduction test. Horses were treated orally with recommended doses of fenbendazole and ivermectin. Resistance to fenbendazole was detected on 20 farms (95.24%) with values of faecal egg count reduction test ranging from 0 to 90%. Ivermectin remained effective in all tested herds with the value of faecal egg count reduction test 96–100%. In autumn 2008, 178 horses on 10 farms were examined. Of these, only seven horses tested were negative for cyathostomins. One farm was tested positively for Anoplocephala perfoliata, and one for Parascaris equorum. In spring 2009, six farms were examined, four of which were the same farms as in 2006. We found a decreased number of eggs per gram in all horses, but an increase in benzimidazole resistance, which was found in 5 farms out of 6 (faecal egg count reduction test 15.2–84.6%). This is the first wide survey in horses from the Czech Republic. Based on this study, we can conclude that benzimidazole resistant cyathostomins in horses are widespread but ivermectin is still fully effective.

Anthelmintic resistance of intestinal nematodes to ivermectin and pyrantel in Estonian horses

2014 ◽  
Vol 89 (6) ◽  
pp. 760-763 ◽  
Author(s):  
B. Lassen ◽  
S.-M. Peltola
Keyword(s):  
Anthelmintic Resistance ◽  
Subjective Evaluation ◽  
The Body ◽  
Anthelmintic Treatment ◽  
Evidence Based ◽  
Ivermectin Treatment ◽  
Horse Population ◽  
Treatment Practices ◽  
Faecal Samples ◽  
Faecal Egg Count

AbstractThere is evidence of resistance in horses to anthelmintic treatment using ivermectin and pyrantel. However, little information is available about the parasites, treatment practices or anthelmintic resistance in the horse population in Estonia. In the present study, we examined 41 trotting and riding horses aged < 3 years from four stables in Estonia. Faecal samples were collected, and horses were selected for treatment if the nematode egg count per gram faeces exceeded 200. Horses (n= 32) that shed strongyle-type eggs were treated with pyrantel, whereas Parascaris equorum-positive animals received ivermectin. Up to 78% of horses required anthelmintic treatment and the efficiency of the anthelmintics was evaluated using a faecal egg count reduction test. Resistance of P. equorum was observed in 50% of horses treated with ivermectin and of strongyles in 27% of horses treated with pyrantel. Ivermectin treatment resulted in a mean reduction of 100% for strongyle eggs and an 89% reduction in P. equorum, and pyrantel-treated horses exhibited an 88% reduction in strongyle eggs. These results are considered to be the first indication of resistance to pyrantel, but further studies of ivermectin resistance are required. According to questionnaires completed by the owners of horses, resistance might be explained by a lack of evidence-based strategies, a strong preference for using ivermectin and possibly a subjective evaluation of the body weight of horses.

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