Aeromonas salmonicida: updates on an old acquaintance

Area of Science:

• Aquatic microbiology
• Fish pathology
• Bacterial virulence

Background:

• Aeromonas salmonicida is an ancient and globally distributed bacterial pathogen affecting fish, particularly salmonids.
• It exists in various marine and freshwater environments and has several subspecies.
• Understanding atypical isolates is crucial for a comprehensive view of the pathogen's impact.

Purpose of the Study:

• To review recent advancements in understanding Aeromonas salmonicida.
• To explore the clinical presentation and virulence factors, including the type 3 secretion system.
• To discuss current and novel strategies for preventing and treating Aeromonas salmonicida infections.

Main Methods:

• Literature review of recent developments in Aeromonas salmonicida research.
• Analysis of new isolate characterizations from diverse hosts.
• Examination of studies on virulence mechanisms and host-pathogen interactions.

Main Results:

• New isolates from non-salmonid hosts broaden the understanding of atypical Aeromonas salmonicida.
• The type 3 secretion system is implicated in suppressing host immune responses.
• Varied antibiotic resistance levels necessitate diverse treatment approaches.

Conclusions:

• Aeromonas salmonicida remains a critical threat to fish health globally.
• Further research into atypical strains and virulence mechanisms is essential.
• Integrated strategies, including prebiotics and probiotics, show promise for disease management.