Mycobacterium liflandii Outbreak in a Research Colony of Xenopus (Silurana) tropicalis Frogs
| Autor: | James G. Fox, Sureshkumar Muthupalani, P. L. C. Small, H. R. Williamson, Courtney Ek, Jacqueline J. Fremont-Rahl |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2010 |
| Předmět: |
Pathology
medicine.medical_specialty Bacilli Xenopus Mycobacterium Infections Nontuberculous Spleen Hemorrhage Biology Article law.invention Disease Outbreaks Mycobacterium law medicine Animals Lung Pancreas Polymerase chain reaction Silurana General Veterinary Ovary biology.organism_classification medicine.disease medicine.anatomical_structure Liver Granuloma Female Granulomatous Dermatitis |
| Popis: | A research colony of Xenopus ( Silurana) tropicalis frogs presented with nodular and ulcerative skin lesions. Additional consistent gross findings included splenomegaly with multiple tan-yellow nodular foci in the spleen and liver of diseased frogs. Copious acid-fast positive bacteria were present in touch impression smears of spleen, skin, and livers of diseased frogs. Histologically, necrotizing and granulomatous dermatitis, splenitis, and hepatitis with numerous acid-fast bacilli were consistently present, indicative of systemic mycobacteriosis. Infrequently, granulomatous inflammation was noted in the lungs, pancreas, coelomic membranes, and rarely reproductive organs. Ultrastructurally, both extracellular bacilli and intracellular bacilli within macrophages were identified. Frogs in the affected room were systematically depopulated, and control measures were initiated. Cultured mycobacteria from affected organs were identified and genetically characterized as Mycobacterium liflandii by polymerase chain reaction amplification of the enoyl reductase domain and specific variable numbers of tandem repeats. In recent years, M. liflandii has had a devastating impact on research frog colonies throughout the United States. This detailed report with ultrastructural description of M. liflandii aids in further understanding of this serious disease in frogs. |
| Databáze: | OpenAIRE |
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