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Chicken coccidiosis: correlation between resistance and delayed hypersensitivity
Poultry Science
|August 1, 1980
Summary
Delayed hypersensitivity (DH) reactions in broiler chickens can predict resistance to coccidiosis. This immune response, measured against Eimeria antigens, correlated well with protection after challenge, indicating its value in vaccine development.
Area of Science:
- Poultry immunology
- Parasitology
- Veterinary medicine
Background:
- Coccidiosis is a significant parasitic disease in broiler chickens, causing substantial economic losses.
- Effective control strategies, including vaccination, are crucial for the poultry industry.
Purpose of the Study:
- To investigate the correlation between delayed hypersensitivity (DH) reactions and resistance to coccidiosis in broiler chickens.
- To evaluate the predictive value of DH responses for coccidiosis immunity.
Main Methods:
- Broiler chickens were immunized with live Eimeria oocysts or a commercial coccidiosis vaccine (CocciVac D).
- Delayed hypersensitivity reactions were assessed using particulate-oocyst antigen extracts.
- Immunized birds were challenged with Eimeria oocysts to evaluate resistance.
Main Results:
- A strong correlation was observed between DH reactions and homologous resistance to Eimeria necatrix and Eimeria tenella.
- The commercial vaccine (CocciVac D) also showed good correlation between DH responses and resistance.
- Cross-reactivity in DH reactions indicated shared antigens among Eimeria species.
Conclusions:
- Delayed hypersensitivity to Eimeria oocyst antigens can serve as a reliable indicator of resistance to coccidiosis in broiler chickens.
- DH testing may be a valuable tool for assessing the efficacy of coccidiosis vaccines and predicting field immunity.