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Journal of Clinical Microbiology, August 1998, p. 2339-2341, Vol. 36, No. 8
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.

Identification of a Rough Strain of Escherichia coli O157:H7 That Produces No Detectable O157 Antigen

Peter Feng,1,* Robin C. Sandlin,2 Choong H. Park,3 Richard A. Wilson,4 and Mitsuaki Nishibuchi5

Division of Microbiological Studies, Food and Drug Administration, Washington, D.C. 202041; Department of Microbiology and Immunology, Uniformed Services University of the Health Sciences, Bethesda, Maryland 208142; INOVA Fairfax Hospital, Falls Church, Virginia 220423; Escherichia coli Reference Center, Pennsylvania State University, University Park, Pennsylvania 168024; and Center for Southeast Asian Studies, Kyoto University, Kyoto, Japan 606-015

Received 17 March 1998/Returned for modification 5 May 1998/Accepted 12 May 1998

MA6, an O157:H7-like strain, did not react with most anti-O157 kits examined; however, it had the rfbE gene that is essential for O157 expression and carried O157:H7 virulence factors. Lipopolysaccharide analysis showed that MA6 is a rough strain that does not produce the O157 antigen, but genetically, it belongs in the O157:H7 clonal group.

* Corresponding author. Mailing address: HFS-516, FDA, 200 C St. SW, Washington, DC 20204. Phone: (202) 205-4518. Fax: (202) 401-7740. E-mail: pxf{at}fdacf.ssw.dhhs.gov.

Journal of Clinical Microbiology, August 1998, p. 2339-2341, Vol. 36, No. 8
0095-1137/98/$04.00+0
Copyright © 1998, American Society for Microbiology. All rights reserved.


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