gyrA and parC mutations and associated quinolone resistance in Vibrio anguillarum serotype O2b strains isolated from farmed atlantic cod (Gadus morhua) in Norway

MIC testing of Vibrio anguillarum isolates recovered from diseased farmed Atlantic cod revealed oxolinic acid MICs of <= 0.001, 0.06, and 16 mu g ml(-1). Single gyrA Ser-Ile substitutions were identified at position 83 of the intermediate and resistant strains, while a parC Ser-Leu substitution at position 85 was found only in the resistant strain.