Escherichia is the genus that includes Escherichia coli. Many E. coli are part of normal intestinal flora, while certain types can cause disease. The Escherichia microbiome entry on GI-MAP should not be read as a positive result for every disease-causing E. coli type.
On this page
The important distinction is the target
The commensal section measures a broad bacterial group. The pathogen section asks narrower questions about E. coli-associated genes and typing markers. EPEC/EHEC, ETEC LT/ST, EIEC/Shigella and Shiga toxin genes therefore need separate interpretation. [1]
Why the same name appears in health and disease
CDC distinguishes several diarrheagenic E. coli pathotypes from the many harmless intestinal E. coli. Their ability to cause illness depends on characteristics that a broad Escherichia quantity cannot establish. Finding the genus is not evidence of food poisoning, and a high genus count cannot identify the responsible strain. [2]
What high or low Escherichia can tell you
A flag tells you how the measured DNA compares with the laboratory’s range. It does not directly measure toxin release, intestinal injury or an infection elsewhere in the body. A low count also cannot establish the absence of every pathogenic strain.
If you are investigating acute diarrhea, the pathogen targets and the clinical assessment matter more than interpreting the commensal count in isolation. If your concern is a urinary infection, stool DNA does not replace appropriate urine testing.
Avoid combining unrelated measurement scales
A GI-MAP quantity, a urine culture colony count and a microbiome percentage are different measurements. Similar organism names do not make their ranges or clinical meanings transferable.
Common questions
Does high Escherichia mean high Shiga toxin?
No. stx1 and stx2 are separate genetic targets; even those are not direct toxin-activity measurements.
Can the commensal result rule out an E. coli infection?
No. It is not a stand-alone rule-out test for pathogenic E. coli or infection at another site.
Sources and review
Sources checked October 7, 2026. Manufacturer material describes the test; clinical guidance and research support the interpretation limits.
- Diagnostic Solutions Laboratory: GI-MAP interpretive guide (manufacturer specifications)
- CDC: Kinds of E. coli
Medical review of this article is pending. For a correction or source question, contact GI MAP Test.