Detection test kit of Escherichia coli O157:H7 by using qPCR. Escherichia coli O157:H7 is an enterohemorrhagic strain of the bacterium Escherichia coli and a cause of illness through food. Infection may lead to hemorrhagic diarrhea, and to kidney failure. Transmission is via the fecal-oral route, and most illness has been through undercooked, contaminated ground beef or ground pork being eaten.