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Effect of Irradiated Toxocara Canis Embryonated Eggs: A Promising Vaccination Strategy
Shreen F Ammar1, Sanaa N Antonios1, Rasha A Elmahy2
1Medical Parasitology Department, Faculty of Medicine, Tanta University, Tanta, Egypt.
Parasite Immunology
|January 14, 2026
Summary
Vaccinating mice with irradiated Toxocara canis eggs, especially using UV treatment, significantly reduced parasite load and inflammation. This suggests a safe and effective vaccine approach for controlling toxocariasis.
Area of Science:
- Veterinary Parasitology
- Immunology
- Zoonotic Diseases
Background:
- Toxocariasis, a global zoonotic disease caused by Toxocara canis, presents significant public health challenges.
- Developing a vaccine is a promising strategy for controlling toxocariasis.
Purpose of the Study:
- To evaluate the protective efficacy of gamma- and UV-irradiated embryonated T. canis eggs in a mouse model.
- To compare the effectiveness of UV-irradiated versus gamma-irradiated vaccines against toxocariasis.
Main Methods:
- Mice were vaccinated with gamma- or UV-irradiated T. canis eggs and subsequently challenged.
- Analyses included scanning electron microscopy, parasitological counts, histopathology, immunohistochemistry, and biochemical assays.
- Key markers assessed were larval counts, IL-1β, CD68, IL-4, IL-10, and IgE levels.
Main Results:
- Vaccination with irradiated eggs significantly reduced larval counts in the brains and livers of mice.
- Vaccinated groups showed fewer histopathological alterations and reduced expression of IL-1β and CD68.
- UV-irradiated vaccines demonstrated superior protective effects compared to gamma-irradiated vaccines.
Conclusions:
- Vaccination with irradiated T. canis eggs, particularly UV-treated, offers a safe and effective method for immunoprophylaxis against toxocariasis.
- UV-irradiated T. canis eggs show significant potential as a cost-effective vaccine candidate for human toxocariasis control.
