Immersion vaccination with an inactivated virulent Aeromonas hydrophila bacterin protects hybrid catfish (Ictalurus punctatus X Ictalurus furcatus) from motile Aeromonas septicemia

- Exposure to a virulent Aeromonas hydrophila (vAh) bacterin protects hybrid catfish.
- Siderophore addition to the culture medium of the bacterin did not impact vaccine efficacy.
- The duration of protection lasted at least 7 weeks against two epidemic vAh isolates.