Translations:Wasseraufbereitung und Grauwassernutzung/796/en
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- They should be part of the normal gut microbiota in healthy people (ideally, they should only be present in the human gastrointestinal tract).
- They should only be present when it is likely that pathogens of faecal origin are present.
- They should be present in larger numbers than the pathogens indicated by them.
- They should also grow outside the digestive tract and be more resistant than pathogenic microorganisms (pathogens).
- They should be more resistant than pathogens under natural conditions as well as after water treatment and survive in greater numbers.
- They should be easily isolated, identified and counted.
- They should themselves not cause a disease.
- Their number should be in relation to the quantity of pathogenic microorganisms.
