Epidemiological typing of Enterobacter aerogenes

Area of Science:

• Microbiology
• Bacterial Typing
• Clinical Diagnostics

Background:

• Accurate classification of clinical bacterial strains is crucial for effective treatment and epidemiological studies.
• Enterobacter aerogenes is a clinically significant bacterium that requires reliable typing methods.
• Existing typing methods for Enterobacter aerogenes may lack sufficient discriminatory power.

Purpose of the Study:

• To evaluate the efficacy of Enterobacter cloacae and Klebsiella typing reagents for classifying clinical Enterobacter aerogenes strains.
• To determine the potential of Klebsiella reagents and bacteriocin typing for Enterobacter aerogenes identification.
• To investigate the antigenic similarities between Enterobacter aerogenes and Klebsiella species.

Main Methods:

• Testing 75 clinical strains of Enterobacter aerogenes against Enterobacter cloacae O antisera and bacteriophages.
• Assessing the reaction of strains with Klebsiella capsular antisera and typing phages.
• Utilizing a set of five Enterobacter aerogenes bacteriocin producers for strain classification.

Main Results:

• None of the Enterobacter aerogenes strains were agglutinated by E. cloacae O antisera or sensitive to E. cloacae bacteriophages.
• A significant majority (70 strains) reacted with Klebsiella capsular antisera, and two-thirds were lysed by Klebsiella typing phages.
• Bacteriocin typing classified 92% of strains into 15 distinct types, demonstrating high discriminatory potential.

Conclusions:

• Enterobacter aerogenes can be effectively typed using Klebsiella typing reagents.
• Bacteriocin typing provides a simple yet effective method for further discriminating between Enterobacter aerogenes strains.
• The observed similarities in capsular antigens between Enterobacter aerogenes and Klebsiella warrant further investigation.