Parascaris and cyathostome nematodes in foals: parasite in transit or real infection?

Kornaś, Sławomir; Cabaret, Jacques; Nowosad, B.

doi:10.2478/v10181-010-0010-7

Cited by 2 publications

(3 citation statements)

References 11 publications

(16 reference statements)

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“…In some cases, ascarids can lead to an obstruction and rupture of the small intestine or death of foals [2][3][4]. In Poland, ivermectin is the most widely used anthelmintic in equine parasite treatment [5,6]. Drug resistance has been reported for Parascaris spp.…”

Section: Resultsmentioning

confidence: 99%

“…1). Drug resistance in equine helminths has been reported across a wide range of climatic conditions and management systems [1,5,6,15,16], and limited efficacy of ivermectin against Parascaris spp. has already been described in other countries than Poland [1,2,8,[17][18][19].…”

Section: Resultsmentioning

confidence: 99%

“…During coprophagia, foals are exposed to "eggs recycling" that can lead to 5% false-positive faecal egg counts in foals [5,20]. The prepatent period of Parascaris spp.…”

Section: Table 2 Estimated Mean Faecal Egg Count Reduction Following mentioning

confidence: 99%

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A survey of ivermectin resistance in Parascaris species infected foals in south-eastern Poland

et al. 2020

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Parascaris spp. are major gastro-intestinal nematodes that infect foals and can lead to respiratory symptoms, poor growth, and in some cases obstruction of the small intestine and death. Ivermectin resistance has been reported for Parascaris spp. in many countries. In Poland, the knowledge of the level of resistance against ivermectin in Parascaris spp. is limited. The aim of this study was to examine the efficacy of ivermectin against Parascaris spp. in foals from southeastern Poland. Foals (n = 225 = reared in 7 stud farms) were treated orally with ivermectin paste. Faecal samples were collected from the rectum of each foal or from the environment straight after defaecation on 1 day prior and 2 weeks after deworming. A faecal egg count (FEC) was performed using the McMaster method with a minimum detection limit of 50 eggs/g. FEC reduction (FECR) was calculated using the Faecal Egg Count Reduction Test. The statistical analysis was limited to foals excreting more than 150 eggs/g before treatment and to stud farms with at least 6 foals excreting at or above this level. Confidence intervals were determined by 1000 bootstraps at farm level and the contribution of sex and age to FECR was quantified using a generalized equation estimation procedure. Parascaris spp. eggs were found in 40% of the foals. Following ivermectin treatment, Parascaris spp. eggs were identified in 28.4% of the foals. The mean estimated FECR ranged from 44% to 97% and average efficacy was 49.3%. FECR was more pronounced in older foals (P-values = 0. 003). The FECR was more pronounced in males than in females (P value = 0.028). This study is the first to indicate a reduced efficacy of ivermectin against Parascaris spp. in foals in Poland.

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