Lungworms (Dictyocaulus arnfieldi): prevalence in live equids in Kentucky

Area of Science:

• Veterinary Parasitology
• Equine Health
• Zoonotic Disease Research

Background:

• Dictyocaulus arnfieldi is a lungworm affecting equids.
• Understanding its prevalence is crucial for equine herd health management.

Purpose of the Study:

• To determine the prevalence of Dictyocaulus arnfieldi infections in Kentucky equids.
• To assess infection rates across different equid species and breeds.

Main Methods:

• Fecal samples from 5,437 equids (horses, ponies, asses) on 91 farms were examined over 15 months.
• Prevalence was calculated for different species, breeds, and farms.
• Equids were categorized based on ivermectin treatment history.

Main Results:

• Overall prevalence in horses was 2% (112/5,379), with 38% of farms having infected horses.
• No infections were found in 19 ponies.
• Prevalence in asses (donkeys and mules) was high at 54% (21/39), with infected asses on 80% of farms where they were examined.

Conclusions:

• Asses are significantly more susceptible to Dictyocaulus arnfieldi infection than horses and ponies.
• Targeted surveillance and management strategies for lungworm should consider the high risk in asses.