Studies on the Desoxycholate Agar for the Detection of the Coliform Group Organisms and the Classification of Isolated Strains by the IMViC Test

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  • UEDA Youji
    The Quality Control Laboratory, Matsuya Department Store

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  • 日常食品より分離した大腸菌群のIMViC-Systemによる分類とその出現状況について
  • ニチジョウ ショクヒン ヨリ ブンリ シタ ダイチョウキングン ノ IMViC-System ニ ヨル ブンルイ ト ソノ シュツゲン ジョウキョウ ニ ツイテ

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8157 strains which showed growth with red or pink colonies on the desoxycholate agar were isolated from 108 samples of foods.<BR>These strains were identified by ordinary methods and classified by IMViC test and the results were summarized as follows.<BR>(1) The confidence of detecting ability of this medium seemed to be low in foods (56.4%).<BR>(2) 4649 out of the isolated strains belonged to coliform group organisms, but it was confirmed an ordinary dispersion between their appearance and the source.<BR>(3) 1537 out of the isolated strains (19.2%) were unclassified by IMViC system, and this problem will be discussed in future.

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