DAO 98:57-62 (2012)  -  DOI: https://doi.org/10.3354/dao02430

Antimicrobial susceptibility of Francisella noatunensis subsp. noatunensis strains isolated from Atlantic cod Gadus morhua in Norway

Cecilie H. Isachsen1, Øivind Vågnes2, Ragnhild Aa. Jakobsen3, Ole B. Samuelsen1,*

1Institute of Marine Research, PO Box 1870 Nordnes, 5817 Bergen, Norway
2National Veterinary Institute, PO Box 1263 Sentrum, 5811 Bergen, Norway
3Department of Biology, University of Bergen, PO Box 7800, 5020 Bergen, Norway
*Corresponding author. Email:

ABSTRACT: A total of 30 isolates of Francisella noatunensis subsp. noatunensis isolated from Atlantic cod Gadus morhua L. were tested for susceptibility, in the form of minimal inhibitory concentration (MIC) values, against the following antibacterial agents: flumequine, oxolinic acid, ciprofloxacin, florfenicol, oxytetracycline, erythromycin, streptomycin sulphate, trimetoprim/sulphadiazine and rifampin. All the isolates had a low susceptibility to oxytetracycline, trimetoprim/sulphadiazine (Tribrissen®), erythromycin, ciprofloxacin and streptomycin with MIC values of 64, 64 to 128, 16, 8 and 32 to 128 µg ml−1, respectively. The strains were, on the other hand, susceptible to florfenicol, oxolinic acid, flumequine and rifampin with MIC values of 0.5, 0.25, 0.25 and 0.25 to 1 µg ml−1, respectively.


KEY WORDS: ■Francisella noatunensis subsp. noatunensis · Susceptibility · Atlantic cod


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Cite this article as: Isachsen CH, Vågnes Ø, Jakobsen RA, Samuelsen OB (2012) Antimicrobial susceptibility of Francisella noatunensis subsp. noatunensis strains isolated from Atlantic cod Gadus morhua in Norway. Dis Aquat Org 98:57-62. https://doi.org/10.3354/dao02430

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