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Protection of loach (M. anguillicaudatus) from A. hydrophila infection by bacteriophage Akh-2. (A) Non-infected negative control. (B) Loach inoculated with A. hydrophila showing hemorrhagic red spots. (C) Loach treated with phage Akh-2 after inoculation with A. hydrophila showing fewer and smaller hemorrhagic red spots (indicated by red boxes). The average fish size was 5 ± 2 cm.
