A quantitative approach to nematode lungworm burdens in goats

Area of Science:

• Veterinary Parasitology
• Animal Pathology

Background:

• Nematode lungworm infections (Protostrongylidae) pose diagnostic challenges in livestock.
• Accurate post-mortem quantification of lungworm burdens is crucial for epidemiological studies and evaluating treatment efficacy.

Purpose of the Study:

• To develop and validate improved methods for quantifying lungworm burdens in goat lungs post-mortem.
• To compare the efficacy of different techniques for recovering various protostrongylid species.

Main Methods:

• Three post-mortem quantification techniques were evaluated: lung perfusion, pepsin-hydrochloric acid digestion followed by perfusion, and examination of calcified worm nodules (Types A, B, C).
• Lung perfusion effectively recovered *Protostrongylus rufescens* and *Cystocaulus ocreatus*.
• Pepsin-HCl digestion enhanced recovery of *Muellerius capillaris* and *Neostrongylus* species.

Main Results:

• Perfusion alone was insufficient for *Muellerius capillaris* and *Neostrongylus* recovery.
• Incubation with pepsin-HCl solution prior to perfusion significantly improved the recovery of these lungworm species.
• Types A and B calcified nodules contained parasites in 75-80% of cases.
• A formula combining perfusion recovery and nodule counts was developed for total lungworm burden estimation.

Conclusions:

• A combined approach of lung perfusion and nodule examination provides a more comprehensive method for quantifying lungworm burdens in goats.
• This improved quantification method offers a reliable basis for assessing the efficacy of anthelmintic treatments in goats.