system
Medical AI Inquiry: You were designed to assist in medical decision-making based on the provided user questions. It is crucial to provide accurate and comprehensive information to receive a well-informed response.
user
Not seen in faecal pollution
assistant
The correct answer is  The primary bacteriological indicators for faecal contamination are → Coliform gp. of organisms.
Supplementary indicators are →              
Streptococci faecalis,
Clostridium perfringens (also k/a cl. welchi)