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Citrobacter freundii as a cause of disease in fish

Author(s): Jeremić Svetlana | Jakić-Dimić Dobrila | Veljović Lj.

Journal: Acta Veterinaria
ISSN 0567-8315

Volume: 53;
Issue: 5-6;
Start page: 399;
Date: 2003;
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Keywords: Citrobacter freundii | isolation | identification | fish | biological experiment

The paper describes an illness of one-year rainbow trout fry that was characterized by gastroenteritis and progressively high mortality, but which did not indicate a typical bacterial infection; and a clinical illness of cyprinids that indicated typical acute bacterial septicemia caused by Gram-negative bacteria. These diseases of rainbow trout and cyprinids were caused by the Gram-negative motile bacterium Citrobacter freundii. Cultures of Citrobacter freundii were isolated and identified on the basis of key phenotypic characters and with the aid of the Api 20 E system. Pathohistological examination confirmed inflammatory changes in the intestine of rainbow trout; and inflammatory and necrotic changes in the internal organs of cyprinids. We were able to reproduce the illness by means of artificial infection with a pure culture of Citrobacter freundii. This is the first published report confirming Citrobacter freundii as a cause of fish disease in Serbia.
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