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Immunity in equine cyathostome infections
1Department of Veterinary Microbiology and Parasitology, School of Veterinary Medicine, Louisiana State University, Baton Rouge 70803, USA.
Veterinary Parasitology
|September 15, 1999
Summary
Horses develop slow, incomplete immunity to cyathostome infections with age. Experimental infections show mature horses resist re-infection, while younger horses may develop mucosal immunity.
Area of Science:
- Veterinary Parasitology
- Equine Immunology
Background:
- Understanding equine immunity to cyathostome infections is crucial for control strategies.
- Current knowledge suggests age-related, slow-developing, and incomplete resistance in horses.
Purpose of the Study:
- To define immune responses to equine cyathostome infections.
- To advance understanding of nematode development, clinical conditions, and control.
Main Methods:
- Analysis of field observations, worm burdens, and fecal egg counts.
- Experimental infections in horses to assess resistance to re-infection.
- Investigation of immune markers like IL-4 gene expression.
Main Results:
- Mature horses exhibit resistance to re-infection across all parasite life stages.
- Younger horses may develop immunity against mucosal-stage parasites.
- Antibody titers against adult worms do not correlate with resistance.
- Increased IL-4 gene expression is linked to parasite expulsion.
Conclusions:
- Equine immunity to cyathostomes is complex, age-dependent, and incomplete.
- Further research using a usable model is needed to advance understanding and control strategies.