First isolation of Carnobacterium maltaromaticum from farmed Rainbow Trout in Virginia.

ABSTRACT

OBJECTIVE: Carnobacterium maltaromaticum is considered an emerging pathogen of salmonids in the United States and around the world. METHODS: Bacterial cultures obtained from the posterior kidney and skin of moribund Rainbow Trout Oncorhynchus mykiss from a commercial aquaculture facility in Virginia, USA, grew C. maltaromaticum, which was confirmed by additional phenotypic and molecular characterization. RESULT: A presumptive diagnosis based on the clinical signs, necropsy observations, histopathology, and bacterial cultures was bacterial septicemia due to C. maltaromaticum. CONCLUSION: This represents the first documentation of C. maltaromaticum in Rainbow Trout from Virginia.