Experimental exposure of zebrafish, Danio rerio (Hamilton), to Mycobacterium marinum and Mycobacterium peregrinum reveals the gastrointestinal tract as the primary route of infection: a potential model for environmental mycobacterial infection
- Harriff, M.J., Bermudez, L.E., and Kent, M.L.
- Journal of fish diseases 30(10): 587-600 (Journal)
- Registered Authors
- Kent, Michael
- MeSH Terms
- Acanthamoeba castellanii/microbiology
- Colony Count, Microbial
- Disease Models, Animal
- Fish Diseases/microbiology*
- Fish Diseases/pathology
- Mycobacterium Infections/microbiology
- Mycobacterium Infections/pathology
- Mycobacterium Infections/veterinary*
- Mycobacterium marinum/pathogenicity
- Time Factors
- Water Microbiology
- 17850575 Full text @ J. Fish Dis.
Harriff, M.J., Bermudez, L.E., and Kent, M.L. (2007) Experimental exposure of zebrafish, Danio rerio (Hamilton), to Mycobacterium marinum and Mycobacterium peregrinum reveals the gastrointestinal tract as the primary route of infection: a potential model for environmental mycobacterial infection. Journal of fish diseases. 30(10):587-600.
The natural route by which fish become infected with mycobacteria is unknown. Danio rerio (Hamilton) were exposed by bath immersion and intubation to Mycobacterium marinum and Mycobacterium peregrinum isolates obtained from diseased zebrafish. Exposed fish were collected over the course of 8 weeks and examined for the presence of mycobacteriosis. Mycobacteria were consistently cultured from the intestines, and often from the livers and spleens of fish exposed by both methods. Mycobacteria were not observed in the gills. Histological analysis revealed that fish infected with M. marinum often developed granulomas accompanied by clinical signs of mycobacteriosis, while infection with M. peregrinum infrequently led to clinical signs of disease. Passage of the bacteria through environmental amoebae (Acanthamoeba castellani) was associated with increased growth of M. peregrinum over the course of 8 weeks, when compared to infection with the bacteria not passed through amoebae. The results provide evidence that zebrafish acquire mycobacteria primarily through the intestinal tract, resulting in mycobacterial dissemination.
Genes / Markers
Mutations / Transgenics
Human Disease / Model
Sequence Targeting Reagents
Engineered Foreign Genes