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Disseminated chlorellosis in a dog.

R R Quigley¹, K E Knowles, G C Johnson

¹Oakland Veterinary Referral Services, 1400 South Telegraph Road, Bloomfield Hills, MI 48302, USA. rquigleydvm@hotmail.com

Veterinary Pathology

|January 30, 2009

Summary

A dog diagnosed with protothecosis showed disseminated green algae infection, identified as Chlorella. This marks the first reported case in a companion animal and the first instance of widespread Chlorella infection.

Area of Science:

Veterinary Pathology
Microbiology
Parasitology

Background:

Protothecosis is a rare disease caused by achlorophyllous algae.
Disseminated infections can occur but are poorly understood in companion animals.
Canine lingual masses can have various etiologies, requiring thorough diagnostic investigation.

Observation:

An adult dog presented with ataxia and a lingual mass, initially presumed to be protothecosis.
Postmortem examination revealed widespread green discoloration in multiple organs, including the tongue, lungs, lymph nodes, liver, and spinal meninges.
Histological examination identified pyogranulomatous inflammation and algal organisms within these tissues.

Findings:

Ultrastructural and histochemical analyses confirmed the organisms as Chlorella, a type of green alga.

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The algae exhibited characteristic cell walls, grana, thylakoid membranes, and starch granules.

This case represents the first documented instance of disseminated Chlorella infection in a companion animal.

Implications:

This study expands the known spectrum of Chlorella infections in domestic animals.
It highlights the importance of considering algal infections beyond typical protothecosis in veterinary diagnostics.
Further research is needed to understand the pathogenesis and transmission of Chlorella in companion animals.