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Challenge of Arctic charr by i.p. injection of Aeromonas salmonicida subsp. achromogenes. (A) Strain Keldur265-87 (wt strain diluted from 5 × 109 CFU/ml); (B) strain Keldur265-87-2 (ΔasaP1 mutant strain diluted from 3 × 109 CFU/ml). The calculated LD50s were 1.6 × 103 CFU fish−1 for strain Keldur265-87 and 1.7 × 104 CFU fish−1 for strain Keldur265-87-2.
