Molecular cross-sectional survey of gastric habronemosis in horses.

This research presents a method for detecting two parasitic nematodes in horses, which cause disease symptoms such as gastric distress, diarrhea, weight loss and stomach ulcers. The technique involves the use of semi-nested PCR to identify marker DNAs in the horses’ feces and identifies over fifty percent positive cases.

Background

• Gastric habronemosis, a disease affecting horses caused by the nematodes Habronema microstoma and Habronema muscae, presents in affected animals as gastritis, diarrhea, weight loss, and ulcers.
• The disease is important in the equine industry, but the epidemiology of this infection remains incomplete due to diagnostic challenges in live animals.

Methodology

• Researchers carried out a two-step semi-nested PCR assay (a type of DNA replication test) on horse fecal samples to detect the DNA of H. microstoma and/or H. muscae.
• In order to evaluate this test’s field efficacy, they carried out a sampling of horse populations in central Italy.
• From the native horses, they collected and analysed 153 individual fecal samples.

Results

• The standard diagnostic test, flotation procedures, did not find any larvated eggs of Habronema, while it successfully identified other endoparasites in 61.2% of the samples.
• The semi-nested PCR method successfully detected the DNA of either H. microstoma, H. muscae, or both in 53.6% of the studied samples.
• There were no discernible statistical differences between infection rates and the sex, age, breeding management, and antiparasitic treatments of the horses.

Conclusion

• This research showcases the higher efficacy of the new testing method over traditional diagnostic tools in detecting Habronema nematode infections in horses.
• The study identifies a greater prevalence of habronemosis in horses than previously expected and emphasizes its potential impact on the equine industry.