Toxins 2011, 3(6), 672-677; doi:10.3390/toxins3060672
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Loss of vtx Genes after the First Subcultivation Step of Verocytotoxigenic Escherichia coli O157 and Non-O157 during Isolation from Naturally Contaminated Fecal Samples

1 Ghent University, Faculty of Veterinary Medicine, Salisburylaan 133, 9820 Merelbeke, Belgium 2 Institute for Agricultural and Fisheries Research, Technology and Food Science Unit, Brusselsesteenweg 370, 9090 Melle, Belgium
* Author to whom correspondence should be addressed.
Received: 12 April 2011; in revised form: 1 June 2011 / Accepted: 8 June 2011 / Published: 20 June 2011
(This article belongs to the Special Issue Shiga Toxin)
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Abstract: Verocytotoxins VT1 and VT2, produced by Verocytotoxigenic Escherichia coli (VTEC), are encoded on temperate bacteriophages. Several studies reported the loss of the vtx genes after multiple subcultivation steps or long preservation. The objective of this study was to determine if the loss of the verocytotoxin genes can already occur during the first subcultivation step. Consequently, the stability of the vtx genes were tested in 40 isolates originating from 40 vtx-positive fecal samples after the first subcultivation step following the isolation procedure. The loss occurred in 12 out of 40 strains tested and was rather rare among the O157 strains compared to the non-O157 strains. This is the first study demonstrating that the loss of the verocytotoxin genes can already occur after the first subcultivation step. This may lead to an underestimation of VTEC positive samples.
Keywords: Escherichia coli; VTEC; loss; vtx genes

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MDPI and ACS Style

Joris, M.-A.; Verstraete, K.; De Reu, K.; De Zutter, L. Loss of vtx Genes after the First Subcultivation Step of Verocytotoxigenic Escherichia coli O157 and Non-O157 during Isolation from Naturally Contaminated Fecal Samples. Toxins 2011, 3, 672-677.

AMA Style

Joris M-A, Verstraete K, De Reu K, De Zutter L. Loss of vtx Genes after the First Subcultivation Step of Verocytotoxigenic Escherichia coli O157 and Non-O157 during Isolation from Naturally Contaminated Fecal Samples. Toxins. 2011; 3(6):672-677.

Chicago/Turabian Style

Joris, Maria-Adelheid; Verstraete, Karen; De Reu, Koen; De Zutter, Lieven. 2011. "Loss of vtx Genes after the First Subcultivation Step of Verocytotoxigenic Escherichia coli O157 and Non-O157 during Isolation from Naturally Contaminated Fecal Samples." Toxins 3, no. 6: 672-677.

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