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GATE2017-3

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Which one of the following organisms is an indicator of fecal contamination?

  1. $\textit{Escherichia coli}$
  2. $\textit{Streptococcus lactis}$
  3. $\textit{Bacillus subtilis}$
  4. $\textit{Lactobacillus acidophilus}$
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