Escherichia coli Stx1+Stx2 toxin stx1+stx2 genes:{Measurement}:-:Stool:-
escherichia coli stx1+stx2 toxin stx1+stx2 genes:{measurement}:-:stool:-
Escherichia coli Stx1 and Stx2 toxin stx1+stx2 genes [Measurement] in Stool
escherichia coli stx1 and stx2 toxin stx1+stx2 genes [measurement] in stool