Survival of Escherichia coli O157:H7 in yoghurt during preparation and storage at 4 degrees C.

Abstract:

:Cow's milk was inoculated with ca 10(3) and 10(7) cfu ml-1 Escherichia coli O157:H7. After fermentation at 42 degrees C for 0-5 h, the yoghurt was stored at 4 degrees C. Two kinds of yoghurt were used: traditional yoghurt (TY), made with Streptococcus thermophilus and Lactobacillus bulgaricus starter cultures, and 'bifido' yoghurt (BY), made with the two starter cultures plus Bifidobacterium bifidum. After 7 d E. coli O157:H7 decreased from 3.52 to 2.72 log10 cfu ml-1 and from 7.08 to 5.32 log10 cfu ml-1 in TY, and from 3.49 to 2.73 log10 cfu ml-1 and from 7.38 to 5.41 log10 cfu ml-1 in BY. The pH values of yoghurt dropped from 6.6 to 4.5 and 4.4 in TY (for low and high pathogen inocula, respectively), and from 6.6 to 4.6 and 4.5 in BY (for low and high pathogen inocula, respectively).

journal_name

Lett Appl Microbiol

authors

Massa S,Altieri C,Quaranta V,De Pace R

doi

10.1046/j.1472-765x.1997.00067.x

subject

Has Abstract

pub_date

1997-05-01 00:00:00

pages

347-50

issue

5

eissn

0266-8254

issn

1472-765X

journal_volume

24

pub_type

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