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Total coliforms are a less specific indicator than E. coli because they also occur in

  • A.sterile laboratory media only
  • B.the human bloodstream but not the gut
  • C.the atmosphere at high altitude
  • D.soil, vegetation and water distribution biofilms

Answer: D

Members of the group are widespread in nature, so a positive total coliform result may reflect soil washings or regrowth in the mains rather than sewage. It remains the standard screening test, with positives followed up specifically for faecal organisms.

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