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What is Which of the following is used as an indicator for recent fecal contamination of water ? and explain in detail?
Faecal streptococci regularly occur in faeces but in much smaller numbers than E.coli. Finding faecal streptococci in water is regarded as impoant confirmatory evidence of recent faecal pollution of water. Finding faecal Cl. perfringens in water in the absence of other organisms is regarded as impoant confirmatory evidence of remote faecal pollution of water. Park's Textbook of Preventive and Social Medicine, 25th edition, Page No. 781