To diagnose infection with STEC, a patient's stool (feces) can be tested in a laboratory for the presence of Shiga toxin. Testing methods used include direct detection of the toxin by immunoassay, or detection of the stx2 gene or other virulence-factor genes by PCR. If infection with STEC is confirmed, the E. coli strain may be serotyped to determine whether O104:H4 is present.
Escherichia coli O104:H4
Escherichia coli O104:H21
Escherichia coli O121
Escherichia coli O157:H7
Enteroaggregative Escherichia coli
Campylobacter upsaliensis
Salmonella enterica subsp. enterica
Salmonella