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Diphtheria is an acute, toxin-mediated infectious disease that primarily affects the upper respiratory tract. It is caused by Corynebacterium diphtheriae, a Gram-positive, pleomorphic rod that lacks spore-forming capability and exhibits a characteristic club-shaped morphology under microscopic examination. While C. diphtheriae can asymptomatically colonize mucosal surfaces, clinical disease manifests only when the bacterial strain is lysogenized by a specific β-corynephage. This phage...

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THE PURIFICATION AND CONCENTRATION OF DIPHTHERIA TOXOID.

A Wadsworth¹, J J Quigley, G R Sickles

¹Division of Laboratories and Research, New York State Department of Health, Albany.

The Journal of Experimental Medicine

|October 30, 2009

Summary

A new method refines diphtheria toxoid into a stable, soluble powder using acetone precipitation. This process enhances antigenic activity, making it suitable for immunization and improving below-standard toxoid potency.

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Area of Science:

Immunology
Biochemistry
Vaccine Development

Background:

Diphtheria toxoid is a crucial vaccine component.
Existing methods for toxoid refinement may impact stability and potency.
Standardization of toxoid preparation is essential for effective immunization.

Purpose of the Study:

To develop a method for refining diphtheria toxoid.
To assess the stability and antigenic activity of the refined toxoid.
To determine if the refinement process can enhance the potency of substandard toxoids.

Main Methods:

Precipitation of diphtheria toxoid using acetone at 4°C.
Dissolving the refined toxoid in physiological salt solution.
Testing stability under various conditions (cold room, 39°C incubation, freezing).
Evaluating flocculating values and antigenic activity in guinea pigs.

Main Results:

Acetone precipitation yielded a stable, soluble diphtheria toxoid powder.
The refined toxoid remained stable for 7 months in a cold room.
Antigenic activity was maintained or enhanced, with some loss of nitrogen content.
Preservative choice (merthiolate vs. phenol) affected stability during freezing.

Conclusions:

Acetone precipitation is an effective method for refining diphtheria toxoid.
The refined toxoid demonstrates good stability and enhanced antigenic activity.
This method can improve the potency of toxoids that are below standard, ensuring effective immunization.