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© Therese Couderc, Marc Lecuit
Publication : Journal of AOAC International

Evaluation of the International Organization for Standardization-International Dairy Federation (ISO-IDF) draft standard method for detection of Enterobacter sakazakii in powdered infant food formulas

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Journal of AOAC International - 01 Sep 2006

Besse NG, Leclercq A, Maladen V, Tyburski C, Bertrand L

Link to Pubmed [PMID] – 17042181

J AOAC Int 2006 Sep-Oct;89(5):1309-16

As a result of the growing recognition of Enterobacter sakazakii as an emergent pathogen, the International Dairy Federation (IDF) and the International Organization for Standardization (ISO) have standardized a reference method for the detection of E. sakazakii in milk powder products and powdered infant food formulas (IFF). The objectives of this study were to assess the applicability of the ISO-IDF draft standard, and to compare several chromogenic selective media for E. sakazakii [ready-to-use ESIATM, homemade E. sakazakii isolation agar, and Druggan-Forsythe-lversen (DFI) agar], and a selective media for Enterobacteriaceae Violet Red Bile Glucose (VRBG). We found that the method is sensitive, selective, and applicable to the analysis of powdered IFF, provided that some modifications are added. In particular, definition of typical colonies on chromogenic media should be less restrictive, and the possibility of using chromogenic media other than ESIA should be introduced. Any of the chromogenic media tested here could be used initially, since their performances were similar. In these media, alpha-glucosidase-positive but non-yellow-pigmented isolates should be also considered. Consequently, the yellow pigmentation test should be abandoned, or completed with another test in order to select colonies to confirm. Although the specificity of VRBG was relatively poor, it could be used as a second nonchromogenic medium.

https://www.ncbi.nlm.nih.gov/pubmed/17042181