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Immunity to Ichthyophthirius infections in fish: a synopsis
1Department of Infectious Diseases, University of Georgia College of Veterinary Medicine, Athens, GA 30602, United States.
Developmental and Comparative Immunology
|July 2, 2013
Summary
Ichthyophthirius multifiliis, a parasite affecting freshwater fish, triggers innate and adaptive immune responses. Research suggests protective vaccines are possible, with immobilization antigens showing promise for subunit vaccines.
Area of Science:
- Ichthyology
- Parasitology
- Immunology
Background:
- Ichthyophthirius multifiliis is a widespread ciliated protozoan parasite impacting freshwater fish globally.
- This parasite causes significant economic losses in food and aquarium fish production.
- It serves as a valuable model for studying fish immunity, including innate, acquired, and mucosal immunity.
Purpose of the Study:
- To review immune responses to Ichthyophthirius multifiliis infection in fish.
- To provide a synopsis of host-parasite immunobiology and vaccine research.
- To identify future research directions for remaining questions regarding fish immunity to this parasite.
Main Methods:
- Review of existing literature on Ichthyophthirius multifiliis and fish immune responses.
- Analysis of studies detailing tissue damage and inflammatory responses in carp and rainbow trout.
- Examination of research on adaptive immunity, antibody production, and protective immunity post-infection.
Main Results:
- Ichthyophthirius multifiliis infection causes significant tissue damage and elicits innate inflammatory responses.
- Adaptive immunity involves phagocytic cell activation and both mucosal and systemic antibody production.
- Fish surviving infection develop protective immunity, with memory B cells indicating long-term humoral memory.
Conclusions:
- Protective immunity following Ichthyophthirius multifiliis infection suggests the theoretical possibility of effective vaccines.
- Vaccination strategies, including exposure to live theronts and purified immobilization antigens, have shown protective effects.
- Immobilization antigens are identified as the most promising candidates for developing subunit vaccines against Ichthyophthirius multifiliis.
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