Which of the following microorganisms is the most commonly used indicator organism for water quality testing?

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Escherichia coli is the most commonly used indicator organism for water quality testing as it is found in the feces of humans and animals and is easily detectable. Its presence in water indicates fecal contamination and the possible presence of harmful pathogens. Salmonella and Shigella also indicate fecal contamination but are less commonly used as indicators. Streptococcus thermophilus is a harmless bacteria used in yogurt production and Hepatitis A virus is a virus that can cause disease but is not commonly used as an indicator organism for water quality testing.

Which of the Following Microorganisms Is the Most Commonly Used