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COLI‐AEROGENES BACTERIA IN FARM WATER SUPPLIES
Author(s) -
THOMAS S. B.,
HOBSON PHYLLIS M.,
DRUCE R. G.,
BOWEN D. L.,
JONES R. G.,
MACKENZIE ELIN,
VAUGHAN W. L. R.
Publication year - 1959
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.1365-2672.1959.tb04607.x
Subject(s) - enterobacter aerogenes , citrobacter freundii , escherichia coli , citrobacter , isolation (microbiology) , klebsiella , veterinary medicine , bacteria , biology , microbiology and biotechnology , enterobacteriaceae , bacteriology , enterobacter cloacae , medicine , biochemistry , genetics , gene
SUMMARY: A series of 825 cultures of coli‐aerogenes bacteria isolated at 30° and a series of 735 cultures isolated at 37° from 645 samples of farm water supplies were classified according to the recommendations of the Coliform Sub‐Committee of the Society for Applied Bacteriology (Report, 1949). Klebsiella constituted 50% of the cultures isolated at 30°, whereas Escherichia coli I was the dominant type, forming 57%, among the cultures isolated at 37°. It would thus appear that isolation at 30° is as selective for Klebsiella as isolation at 37° is for Escherichia . Coli‐aerogenes organisms, mainly 37° negative strains of Citrobacter freundii I and K. cloacae , were found in waters of high sanitary quality derived from protected springs and wells; but the coli‐aerogenes microflora of polluted water was dominated by E. coli I, which formed 43% of the isolates at 30° and 76% of those at 37°. The results for a series of fortnightly samples from 11 farm water supplies showed a marked seasonal variation in the incidence of different types isolated at 30°; E. coli I formed a higher proportion in summer than in winter, while 37° negative strains of Klebsiella and Citrobacter formed a higher proportion in winter than in summer.