Identification error of Aeromonas aquariorum: a causative agent of septicemia

Area of Science:

• Microbiology
• Genetics
• Clinical Diagnostics

Background:

• Accurate identification of bacterial pathogens is essential for effective treatment.
• Aeromonas species are increasingly recognized as causes of bloodstream infections.
• Phenotypic identification methods may lack accuracy for certain bacterial groups.

Purpose of the Study:

• To genetically re-identify Aeromonas blood isolates previously identified using phenotypic methods.
• To assess the accuracy of common identification systems for Aeromonas species.
• To evaluate the clinical significance of misidentified Aeromonas strains, particularly Aeromonas aquariorum.

Main Methods:

• Genetic re-identification of 7 Aeromonas blood isolates using molecular techniques.
• Comparison of genetic identification results with initial phenotypic identifications.
• Assessment of cytotoxic activities of identified Aeromonas strains against human blood cell lines.

Main Results:

• Genetic re-identification revealed that 5 out of 7 (71.4%) isolates were misidentified by phenotype-based systems.
• Aeromonas aquariorum was the most frequently misidentified organism.
• The misidentified Aeromonas aquariorum strains exhibited potent cytotoxic activities against human blood cell lines.

Conclusions:

• Phenotypic identification systems demonstrate significant limitations in accurately identifying Aeromonas blood isolates.
• Correct identification of Aeromonas aquariorum is critical due to its association with high cytotoxic potential.
• Molecular methods are recommended for accurate identification of Aeromonas species in clinical settings to ensure appropriate patient management.