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Volume 10, Number 8—August 2004

Dispatch

Human Escherichia coli O157:H7 Genetic Marker in Isolates of Bovine Origin

Jeffrey T. LeJeune*Comments to Author , Stephen T. Abedon*, Kaori Takemura*, Nicholas P. Christie*, and Srinand Sreevatsan*
Author affiliations: *Ohio State University, Wooster, Ohio, USA

Main Article

Table 2

Shiga toxin production by Escherichia coli O157:H7 by Q allele

Assay

Response
Q allele Median Minimum Maximum
OD600nm noninduced
Q933
0.442
0.153
2.814

Q21
0.170
0.120
0.413
OD600nm induced
Q933
1.228
0.172
2.896

Q21
0.165
0.084
1.210
Fold increase in OD600nm after inductiona Q933
2.2
0.3
7.7
Q21 0.9 0.4 5.1

a(ODinduced)/(ODnoninduced). The maximum and minimum optical density readings at 600 nm listed in each row are not necessarily from the same isolate; therefore, the maximum- and minimum-fold increase cannot be calculated directly from the table.

Main Article

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