In doubtful cases, the presence of which organism confirms the fecal contamination of water-
Park's textbook of preventive and social medicine 23rd edition. the presence of spores of Cl. perfringens in a natural water suggest that fecal contamination has occurred and their presence in the absence of coliform group suggest fecal contamination occurred at some remote time.
Protozoa
Yeast
Clostridium perfringes
Fungi
Environment and health