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Clinical, humoral, and pathologic findings in adult alpacas with experimentally induced Corynebacterium pseudotuberculosis infection.

American journal of veterinary research·2006

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Immunization of Alpacas (Lama pacos) with Protein Antigens and Production of Antigen-specific Single Domain Antibodies

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Protection in alpacas against Corynebacterium pseudotuberculosis using different bacterial components.

Walter U Braga¹

¹Instituto Veterinario de Investigaciones Tropicales y de Altura IVITA, Facultad de Medicina Veterinaria, Universidad Nacional Mayor de San Marcos, San Borja, Lima, Peru. wbraga@vet.ksu.edu

Veterinary Microbiology

|September 20, 2006

Summary

The toxin component of Corynebacterium pseudotuberculosis vaccines induced dose-dependent protective immunity in alpacas, preventing abscess formation. Cell wall components offered less protection against this bacterium.

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Area of Science:

Veterinary Immunology
Bacteriology
Vaccinology

Background:

Corynebacterium pseudotuberculosis causes significant lymphadenitis in small ruminants and camelids.
Developing effective vaccines against C. pseudotuberculosis is crucial for livestock health.

Purpose of the Study:

To evaluate the immunoprotective potential of different doses of C. pseudotuberculosis cell wall and toxin components in alpacas.
To determine the efficacy of candidate vaccines against C. pseudotuberculosis challenge.

Main Methods:

Alpacas were vaccinated with varying doses of C. pseudotuberculosis cell wall (250-500 µg/ml) or toxin (133-265 µg/ml), with muramyl dipeptide adjuvant.
Vaccinated and control alpacas were challenged intradermally with C. pseudotuberculosis.
Protection was assessed by monitoring for abscesses, bacterial presence, and humoral immune response.

Main Results:

High-dose toxin vaccination completely prevented abscess formation.
Low-dose toxin and cell wall vaccinations resulted in reduced, but still present, abscesses.
All vaccinated alpacas exhibited a robust humoral response post-challenge.

Conclusions:

The toxin of C. pseudotuberculosis is a key antigen for inducing protective immunity in alpacas.
Vaccine efficacy is dose-dependent, with higher toxin doses providing superior protection.
Further development of toxin-based vaccines is warranted for C. pseudotuberculosis control in alpacas.