"E. coli O157" . "O157" . "Escherichia coli O157:H7" . "pathogenic ''E.coli''" . "O157:H7" . . "''E coli'' O157:H7" . "''E. coli'' O157" . . "''E. coli'' O157:H7" . "E.coli" . "EHEC" . "E.coli 0157" . "pathogenic strains" . "008.04" . . . . "E. coli O157:H7" . . "A04.3" . "''Escherichia coli'' (strain K12)" . "''E. coli ''O157:H7" . . . . . "''E. coli'' 0157:H7" . "O157:H7 strain of ''E. coli''" . "''Escherichia coli'' O157:H7" . "''E. coli'' O157:H7" . "E. coli" . . "O157:H7 strain" . "Escherichia coli" . "Escherichia coli O157:H7" . "''E. coli'' O157:H7" .