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A Duplex Digital PCR Assay for Simultaneous Quantification of the Enterococcus spp. and the Human Fecal-associated HF183 Marker in Waters
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Underestimation of Fecal Coliform Counts in Shellfish-Growing Waters by the Spanish Official Method.

M Araujo1, R A Sueiro1, A Amezaga1

  • 1Laboratory of Microbiology, Institute of Food Research and Analysis, University of Santiago de Compostela, 15.706-Santiago de Compostela, Spain.

Journal of Food Protection
|May 30, 2019
PubMed
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The APHA method provides higher fecal coliform counts in mussels than the Spanish CP method. Results indicate the CP method is unsuitable for enumerating fecal coliforms in mussels.

Keywords:
Methodsfecal coliformsshellfish-growing waters

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Area of Science:

  • Microbiology
  • Food Safety
  • Marine Biology

Background:

  • Fecal coliforms are indicators of fecal contamination in seafood.
  • Accurate enumeration methods are crucial for public health and regulatory compliance.
  • The Spanish official method (CP method) is proposed as a standard for mussel testing.

Purpose of the Study:

  • To compare the accuracy of the APHA method and the CP method for enumerating fecal coliforms in mussels.
  • To evaluate the suitability of the CP method for regulatory purposes in Galicia, Spain.

Main Methods:

  • Two tube fermentation methods were compared: the APHA method and the Spanish official method (CP method).
  • Fecal coliforms in mussel samples were enumerated using both methods.
  • Statistical analysis was performed to compare the counts obtained by each method.

Main Results:

  • The APHA method yielded significantly higher fecal coliform counts (P < 0.01) compared to the CP method.
  • The discrepancy was most pronounced in samples with fewer than 500 fecal coliforms per 100 g.
  • A significantly greater number of samples were classified as unacceptable (>300 fecal coliforms per 100 g) by the APHA method.

Conclusions:

  • The APHA method is more sensitive in detecting fecal coliforms in mussels.
  • The CP method may underestimate the level of fecal contamination.
  • The CP method is deemed inappropriate for the enumeration of fecal coliforms in mussels.