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Enumeration by a miniaturized method of Escherichia coli, Streptococcus bovis and enterococci as indicators of the origin of faecal pollution of waters
Author(s) -
Pourcher AnneMarie,
Devriese L.A.,
Hernandez J.F.,
Delattre J.M.
Publication year - 1991
Publication title -
journal of applied bacteriology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.889
H-Index - 156
eISSN - 1365-2672
pISSN - 0021-8847
DOI - 10.1111/j.1365-2672.1991.tb02752.x
Subject(s) - feces , escherichia coli , microbiology and biotechnology , enterococcus faecalis , enterococcus hirae , biology , enterococcus , sewage , streptococcus , streptococcus bovis , enumeration , escherichia , veterinary medicine , bacteria , food science , antibiotics , fermentation , medicine , biochemistry , rumen , genetics , mathematics , combinatorics , waste management , gene , engineering
Counts of Escherichia coli , faecal streptococci and enterococci were made on faecal specimens from human and animal origin and urban raw sewage waters, with microtiter plates containing selective substances. Escherichia coli was more numerous than faecal streptococci and enterococci in 80% of the samples regardless of the origin. Consequently the use of the ratio E. coli /faecal streptococci to distinguish human from animal origin of faecal pollution is questionable. Enterococcus faecalis was predominant in human and poultry faeces, Streptococcus bovis was typical of the bovine faeces and to a lesser extent also of pig faeces whereas Enterococcus durans, Ent. hirae and Ent. faecium did not characterize any faecal source. Streptococcus bovis could be distinguished in the mictrotiter plate by its inability to reduce triphenyl tetrazolium chloride (TTC) in the medium.