Improved m-Enterococcus agar for counting faecal streptococci in sea water

Area of Science:

• Environmental microbiology
• Marine biology
• Microbial ecology

Background:

• Accurate enumeration of faecal streptococci is crucial for assessing marine water quality.
• Existing methods may face challenges with seawater matrices.
• Need for a selective and efficient medium for marine environments.

Purpose of the Study:

• To develop and validate an improved culture medium for quantifying faecal streptococci in seawater.
• To enhance the reliability and accuracy of microbial water quality testing.

Main Methods:

• Modification of m-Enterococcus agar by incorporating colistin sulphate (20 mg/l) and oxolinic acid (10 mg/l).
• Testing the efficacy of the enhanced medium on seawater samples.
• Comparative analysis of colony counts before and after colony identification.

Main Results:

• The enhanced medium effectively counted faecal streptococci without inhibition from added antibiotics.
• No significant differences were found in colony counts pre- and post-identification.
• The modified medium demonstrated high specificity and sensitivity for marine samples.

Conclusions:

• The developed medium is a superior choice for faecal streptococci enumeration in seawater.
• This advancement improves the accuracy of marine microbial pollution assessment.
• Recommended for routine use in marine water quality monitoring programs.