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Updated: Sep 22, 2026

Multiplexed Fluorometric ImmunoAssay Testing Methodology and Troubleshooting
Published on: December 12, 2011
Immunodiagnostic assays
1Department of Veterinary Microbiology, Louisiana State University, Baton Rouge, USA.
Insights
Equine immune system defects, including deficiencies and misdirected functions, are complex. Advanced diagnostic technologies are crucial for identifying novel immunodeficiency syndromes and misdirected immune responses in horses.
Area of Science:
- Veterinary Immunology
- Equine Health
- Immunodiagnostics
Background:
- The equine immune system is a complex network with potential for deficiencies or misdirected functions.
- Current diagnostic assays primarily assess humoral immunity, potentially overlooking defects in innate and cellular immunity.
Purpose of the Study:
- To highlight the limitations of current diagnostic assays for equine immune system defects.
- To emphasize the need for advanced immunodiagnostic technologies to identify novel syndromes.
Main Methods:
- Review of existing and emerging diagnostic assays for immune function evaluation.
- Discussion of the implications of humoral immunity assays for cellular immunity.
Main Results:
- Existing assays for immune deficiencies in horses are limited, mainly focusing on humoral immunity.
- Potential for undetected defects in innate and cellular immunity is significant.
Conclusions:
- Newer and future immunodiagnostic technologies are essential for characterizing equine immunodeficiency syndromes.
- Diligent surveillance and advanced technologies are needed to detect misdirected immune responses in horses.
Abstract:
The immune system is a complex interactive network. Defects in its function can be characterized broadly as being the result of actual deficiencies in the network or misdirection of normal immunologic functions. The assays that are available to detect deficiencies in the immunologic network barely scrape the surface of the possibilities. These assays primarily evaluate humoral immune function, but undetected defects in innate and cellular immunity are sure to exist. Although assays of humoral immunity have allowed the characterization of a number of immunodeficiency syndromes in horses, closer evaluation of the equine immune system using newer assays described in this text, as well as future assays yet to be developed are sure to determine new syndromes. Assays of misdirected immunologic functions have been limited to detection of misdirected antibody responses, but the dependence of antibody production on help from T cells could reflect an underlying defect of cellular immunity. Similar to immunodeficiency syndromes, misdirected responses of the innate and adaptive arms of immunity are sure to occur but will only be detected by more diligent surveillance of diseased horses and application of new immunodiagnostic technologies.
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