Related Experiment Video
Updated: Jun 6, 2026

Experimental Infection of Mice with the Parasitic Nematode Strongyloides ratti
Published on: January 17, 2025
A child with raccoon roundworm meningoencephalitis: A pathogen emerging in your own backyard?
Jan Hajek1, Yvonne Yau, Peter Kertes
1Division of Infectious Diseases;
Insights
Baylisascaris procyonis, or raccoon roundworm, can cause severe brain and eye disease. Early diagnosis and treatment of Baylisascaris procyonis encephalitis in a Canadian child led to a remarkable recovery, highlighting the importance of prompt medical care.
Area of Science:
- Veterinary Neurology
- Parasitology
- Infectious Diseases
Background:
- Baylisascaris procyonis (raccoon roundworm) is a zoonotic parasite known to cause severe neurological and ocular disease in humans.
- Human infections are typically associated with ingestion of embryonated eggs from raccoon feces.
Observation:
- A case of Baylisascaris procyonis encephalitis in a seven-year-old boy in Canada is presented.
- The patient exhibited severe neurological impairment consistent with neural larva migrans.
Findings:
- The case represents the first documented instance of Baylisascaris procyonis encephalitis in Canada.
- Prompt diagnosis and initiation of treatment led to a significant clinical recovery in the affected child.
Implications:
- This case underscores the critical importance of maintaining a high index of clinical suspicion for Baylisascaris procyonis infections, even in regions where it is not commonly reported.
- Early therapeutic intervention is crucial for improving outcomes and mitigating the devastating effects of raccoon roundworm encephalitis.
Abstract:
Raccoon roundworm (Baylisascaris procyonis) is a cause of devastating neural and ocular disease. The first documented case of raccoon roundworm encephalitis in Canada, in a seven-year-old boy who presented with severe neurological impairment, is presented. His significant recovery illustrates the importance of clinical suspicion and the benefit of early treatment.
Related Concept Videos
Rabies
Toxoplasmosis
Reservoir of Infection
Arboviral Encephalitis
Rocky Mountain Spotted Fever
Viral Meningitis

