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Protothecosis by Prototheca wickerhamii in goats.

Expedito K A Camboim, Felício Júnior Garino, Antônio F M Dantas

|March 27, 2010

Summary

This study details a new case of protothecosis in goats caused by Prototheca wickerhamii. The infection presented as ulcerative lesions and respiratory distress in an immunocompetent animal, proving resistant to treatment.

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Area of Science:

Veterinary Mycology
Infectious Diseases in Livestock

Background:

Protothecosis is a rare infection caused by achlorophyllic algae of the genus Prototheca.
While documented in various species, cases in goats are infrequent.

Observation:

A goat presented with severe respiratory difficulty and ulcerative nodules on the face, nasal vestibule, and nostrils.
Prototheca wickerhamii was isolated from the lesions.
The affected goat showed no signs of immunodepression.

Findings:

The isolated Prototheca wickerhamii strain exhibited high resistance to antimicrobial drugs.
Histopathology revealed necrotizing pyogranulomatous dermatitis, rhinitis, and osteomyelitis.
Treatment with fluconazole was unsuccessful, and the animal was euthanized 10 months post-diagnosis.

Implications:

Protothecosis in goats appears to be a chronic, progressive infection in immunocompetent animals.
The disease manifests as multifocal, ulcerative, and necrotizing lesions.
This case highlights the challenges in treating protothecosis in livestock due to antimicrobial resistance.