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Bacteria associated with false-positive most-probable-number coliform test results for shellfish and estuaries.

Authors
  • Hussong, D
  • Damaré, J M
  • Weiner, R M
  • Colwell, R R
Type
Published Article
Journal
Applied and environmental microbiology
Publication Date
Jan 01, 1981
Volume
41
Issue
1
Pages
35–45
Identifiers
PMID: 7013700
Source
Medline
License
Unknown

Abstract

Aerobic and facultatively anaerobic bacteria isolated from false-positive, presumptive, total coliform, most-probable-number tests of Chesapeake Bay oyster, water, and sediment samples were characterized and then classified by numerical taxonomy. A total of 538 bacterial strains clustered into 17 phena, the predominant groups of which were Enterobacteriaceae (including Escherichia coli), Aeromonas spp., and Bacillus spp. Bacillus spp. were recovered most frequently from sediment samples. Gas-producing strains which were not members of the Enterobacteriaceae were not isolated during this study. However, disproportionately large numbers of atypical and anaerogenic lactose-fermenting strains were encountered. We concluded that no single, specific bacterial group can be identified as being responsible for the false-positive reaction in the presumptive coliform test. Instead, the false-positive reaction is a result of complex interactions among various genera, representing predominantly bacteria other than coliforms.

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