Peer-reviewed veterinary case report
Dog with swollen lymph node caused by algal infection
By Oliveira, Ryan D et al.·Published in Veterinary pathology·2020·6760Washington State University, United States·View original on PubMed →
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Original publication title: Algal Lymphadenitis in a Dog Caused bySpecies.
- Species:
- dog
Plain-English summary
A 6-year-old spayed female Labrador/Weimaraner mix was found to have an enlarged lymph node during a routine check-up. A biopsy revealed that the lymph node was affected by a type of green algae, which caused inflammation but did not make the dog sick otherwise. Despite the unusual finding, the dog remained healthy and showed no symptoms related to the infection. This case is notable as it is the first reported instance of this type of algae infection in a dog.
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Abstract
A 6-year-old, spayed female Labrador/Weimaraner cross-breed dog that had previously lived in Arizona presented in Montana for an annual examination with an incidentally enlarged popliteal lymph node, which was subsequently biopsied. Histologically, the lymph node was expanded by eosinophil-rich granulomas with both extracellular and intrahistiocytic green algae. These algae had intracytoplasmic, birefringent, and refractile granules; readily formed 2 to 3 mm green colonies on Columbia blood agar medium; and ultrastructurally had a multilayered cell wall and intracytoplasmic chloroplasts. Amplified product from the internal transcribed spacer and D1/D2 regions of the 28S ribosomal RNA gene had high sequence identity tosp. Despite similar infection in the retropharyngeal lymph node 1 year later, the animal remained otherwise healthy with no clinical signs. To the authors' knowledge, this is the first case ofspecies infection in a dog and is a differential diagnosis for.
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Search related cases →Original publication on PubMed: https://pubmed.ncbi.nlm.nih.gov/32783503/