Early Ascaris suum migration in mice as a model for pigs

Area of Science:

• Parasitology
• Immunology
• Animal Models

Background:

• Ascaris suum is a significant roundworm parasite affecting both animals and humans.
• Understanding the early migratory patterns of A. suum is crucial for developing effective control strategies.
• The pig is the natural host, but alternative models are needed for specific research.

Purpose of the Study:

• To investigate the early migratory pathway of Ascaris suum larvae in a mouse model.
• To determine the time course of larval migration from oral inoculation to internal organs.
• To assess the suitability of the mouse as an experimental model for A. suum intestinal immunity.

Main Methods:

• Mice were orally inoculated with 2,500 infective A. suum eggs.
• Mice were euthanized at specific time points: 2, 4, 6, 8, 10, and 12 hours postinoculation (PI).
• Necropsy was performed to identify and track the location of A. suum larvae within the host.

Main Results:

• Ascaris suum larvae were observed penetrating the mouse cecum and colon.
• Larvae successfully reached the liver as early as 4 hours PI.
• The observed migratory pattern in mice closely resembled that in the natural host, the pig.

Conclusions:

• The mouse model effectively replicates the early intestinal migration of Ascaris suum.
• This study supports the use of mice for investigating intestinal immunity during the initial phase of A. suum infection.
• The rapid larval migration highlights the importance of early-stage interventions.