Critical tests of anthelmintic activity of a paste formulation of thiabendazole in horses.

This article presents a study on the effectiveness of a thiabendazole paste in treating distinct horse parasites. The researchers examined variable doses and their impact on strongyles, ascarids, pinworms, and bots in 11 horses.

Overview of the Research

• The research was aimed at determining the effect of a paste formulation of thiabendazole (an anthelmintic or deworming agent) on different types of equine parasites, including large strongyles, ascarids, mature pinworms, and botflies.
• Anthelmintics are drugs that effectively kill parasitic worms, and thiabendazole is one such medication that has been used for several types of worm infestations.
• The investigation involved 11 horses, which were treated with two different doses- 44 mg/kg to 3 horses, and 88 mg/kg to 8 horses- to examine the potential changes in efficacy with different dosage levels.

Findings of the Research

• The impact of thiabendazole on different parasites varied significantly with the dosage.
• Both unicellular and multicellular parasites like Strongylus vulgaris and mature Oxyuris equi were 100% eliminated at both dose levels.
• The results against another parasite, Strongylus edentatus, varied. For the 44 mg/kg dosage, the effectiveness ranged between 95 to 99%, while for the 88 mg/kg dosage, efficiency moved between 89 to 100%.
• Strongylus equinus, another equine parasite, was completely eliminated in the single infected horse treated with a dose of 88 mg/kg.
• The efficacy of the drug against Parascaris equorum varied widely- 46% for the smaller dosage and between 32 to 100% for the larger dosage.
• Thiabendazole was found to be inactive on two types of botflies, Gasterophilus intestinalis, and Gasterophilus nasalis.

Implications of the Study

• This research contributes to the existing body of knowledge on anthelmintic treatment, particularly with thiabendazole, in horses.
• The varying efficacy against different parasites at different dosage levels establishes the need for targeted treatments based on the specific type of parasitic infestation.
• The study also brings to focus the possibility of drug resistance in certain parasites, as seen with Gasterophilus intestinalis and Gasterophilus nasalis, signalling important future research areas.