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Choice and specificity of complement in complement fixation assay.

J Sethi, D Pei, Y Hirshaut

Journal of Clinical Microbiology

|May 1, 1981

Summary

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Choosing the right complement source is crucial for accurate antigen-antibody (Ag-Ab) complement fixation assays. Different animal and human sera significantly impact assay sensitivity and antibody titer results.

Area of Science:

Immunology
Virology
Microbiology

Background:

Complement fixation assays are vital for detecting antigen-antibody reactions.
The source of complement serum can influence assay outcomes.
Previous studies have not comprehensively evaluated various complement sources across diverse antigen-antibody systems.

Purpose of the Study:

To investigate the relative activity of different complement sources in antigen-antibody (Ag-Ab) complement fixation assays.
To determine how various serum complements affect antibody titers and assay sensitivity.
To identify optimal complement sources for specific Ag-Ab systems.

Main Methods:

Microcomplement fixation assays were performed using antigen-antibody systems including cytomegalovirus, adenovirus, Pneumococcus, Coccidiodes, and guinea pig kidney.

Related Experiment Videos

Antibody titers were measured using complement from various sources: rabbit, monkey, cat, dog, human cord, human adult, and guinea pig sera.

The binding capacity of antigen-antibody complexes with different species' complement was assessed.

Main Results:

Assay sensitivity and antibody titers were significantly influenced by the chosen complement source.
Guinea pig, rabbit, and monkey sera yielded comparable titers across most tested Ag-Ab systems.
Cat serum detected only anti-adenovirus and anti-Pneumococcus reactivity, while human adult, human cord, and dog sera showed anti-complementary activity.

Conclusions:

The selection of complement source is critical for both the specificity and sensitivity of complement fixation assays.
Significant inter-species variability exists in complement activity, necessitating careful source selection for reliable diagnostic results.
Optimizing complement source selection can enhance the diagnostic utility of complement fixation tests in various immunological investigations.