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Protective immune response against foot-and-mouth disease
K C McCullough1, F De Simone, E Brocchi
1Institut für Viruskrankheiten und Immunprophylaxe, Basel, Switzerland.
Abstract:
The causative agents of foot-and-mouth disease (FMD) are small icosahedral viruses of the Aphthovirus group within the Picornaviridae family. There is no evidence that these viruses infect cells of the immune system or otherwise interfere detrimentally with their function; additionally, it has not been possible to relate cytotoxicity reactions against virus-infected cells to the efficacy of the immune response against FMD virus infection. In contrast, there is a close association between FMD virus antibody and the protective immune response (10, 14, 15, 20, 24, 25, 29-32). Induction of this antibody is dependent on the structure of the viral antigenic sites (7-9, 11, 18) and on the concomitant presence of Th-lymphocyte epitopes (4, 5, 7, 8), although a Th-lymphocyte-independent response has been reported (2). Recent work by Piatti et al. (26) showed that the immune response induced by FMD virus was only Th-lymphocyte dependent when low doses of antigen were used. This latter work was performed in mice, and it is not certain that a similar situation would be found in cattle. As for the major effector immune defense, this relies on the interaction between antibody-virus complexes and the phagocytic cells of the reticuloendothelial system (17, 19).
Insights
Foot-and-mouth disease (FMD) virus primarily elicits a protective immune response through antibodies, not direct immune cell infection. Antibody production depends on viral structure and T-helper cell epitopes, crucial for effective FMD immunity.
Area of Science:
- Virology
- Immunology
- Veterinary Medicine
Background:
- Foot-and-mouth disease (FMD) is caused by small icosahedral viruses in the Aphthovirus genus.
- FMD virus does not appear to infect immune cells or impair immune function.
- The protective immune response against FMD is strongly associated with antibody production.
Purpose of the Study:
- To investigate the mechanisms underlying the protective immune response to FMD virus.
- To understand the role of viral antigenic sites and T-helper cell epitopes in antibody induction.
- To clarify the dependence of the immune response on T-helper lymphocytes.
Main Methods:
- Review of existing literature on FMD virus immunology.
- Analysis of the relationship between viral structure, epitopes, and antibody response.
- Consideration of T-helper lymphocyte dependence in immune responses.
Main Results:
- Antibody production against FMD virus is critical for protective immunity.
- Antibody induction is influenced by viral antigenic sites and T-helper lymphocyte epitopes.
- T-helper lymphocyte dependence of the immune response may be dose-dependent and species-specific (e.g., mice vs. cattle).
Conclusions:
- The primary defense against FMD virus involves antibodies interacting with phagocytic cells.
- Understanding epitope structure is key to developing effective FMD vaccines and immune strategies.
- Further research is needed to confirm T-helper lymphocyte roles in cattle immunity to FMD.