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Infection and Immunity, December 1999, p. 6710-6714, Vol. 67, No. 12
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.

Isogenic Lysogens of Diverse Shiga Toxin 2-Encoding Bacteriophages Produce Markedly Different Amounts of Shiga Toxin

Patrick L. Wagner, David W. K. Acheson, and Matthew K. Waldor*

Division of Geographic Medicine and Infectious Diseases, New England Medical Center and Tufts University School of Medicine, Boston, Massachusetts 02111

Received 16 August 1999/Returned for modification 9 September 1999/Accepted 17 September 1999

We produced isogenic Escherichia coli K-12 lysogens of seven different Shiga toxin 2 (Stx2)-encoding bacteriophages derived from clinical Shiga toxin-producing E. coli (STEC) isolates of serotypes O157:H7, O145, O111, and O83 to assess the variability among these phages and determine if there were phage-related differences in toxin production. Phage genomic restriction fragment length polymorphisms (RFLP) and superinfection resistance studies revealed significant differences among these phages and allowed the seven phages to be placed into five distinct groups. Experiments revealed striking differences in spontaneous phage and toxin production that were correlated with the groupings derived from the RFLP and resistance studies. These results suggest that the genotype of the Stx2 prophage can influence the level of phage release and toxin expression by host strains and thus may be relevant to STEC pathogenesis.

* Corresponding author. Mailing address: Division of Geographic Medicine and Infectious Diseases, New England Medical Center no. 041, 750 Washington St., Boston, MA 02111. Phone: (617) 636-7618. Fax: (617) 636-5292. E-mail: matthew.waldor{at}es.nemc.org.

Infection and Immunity, December 1999, p. 6710-6714, Vol. 67, No. 12
0019-9567/99/$04.00+0
Copyright © 1999, American Society for Microbiology. All rights reserved.


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