Identification of a Rough Strain of Escherichia coli O157:H7 That Produces No Detectable O157 Antigen |
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Authors: | Peter Feng Robin C. Sandlin Choong H. Park Richard A. Wilson Mitsuaki Nishibuchi |
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Affiliation: | 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. |
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Abstract: | 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. |
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