Occurrence of Enterococcus spp. in waters

Area of Science:

• Microbiology
• Environmental Science
• Bacteriology

Background:

• Enterococci are important indicator organisms in water quality assessment.
• Accurate identification of enterococci species is crucial for environmental monitoring and public health.
• Slanetz-Bartley agar is a common medium for detecting enterococci.

Purpose of the Study:

• To identify and characterize enterococcal strains isolated from surface waters.
• To investigate the relationship between colony morphology on Slanetz-Bartley agar and the taxonomic classification of enterococci.

Main Methods:

• Isolation of bacterial strains from surface water samples.
• Determination of enterococci using Slanetz-Bartley agar.
• Characterization using conventional tests and commercial test kits.
• Analysis of colony morphology (color, size) on Slanetz-Bartley agar.

Main Results:

• Out of 630 strains, 523 were identified as enterococci, with Enterococcus foecium and Enterococcus faecalis being the most prevalent species.
• 150 strains were classified as Enterococcus sp., and 107 were non-enterococci.
• Identified enterococci showed varied colony colors (purple, red, pink, cream) on Slanetz-Bartley agar.
• No correlation was found between colony morphology and the taxonomic characterization of enterococcal strains.

Conclusions:

• Surface waters harbor a diverse range of enterococci species.
• Slanetz-Bartley agar facilitates the detection of enterococci, but colony characteristics are not reliable for species-level identification.
• Further molecular or biochemical methods are necessary for precise enterococci identification and water quality assessment.