Escherichia coli (E. coli) in raw milk by culture (qualitative screening)

Why This Test Matters

E. coli in raw milk can come from contaminated sources like animal feces or improper handling. While some E. coli strains are harmless, others produce toxins that can lead to severe infections, vomiting, diarrhea, or kidney failure. This test helps ensure milk is safe for consumption by detecting the presence of these harmful bacteria.

What to Expect During Testing

No special preparation is needed. A sample of raw milk is sent to a lab for culture, where bacteria are grown on specific media to identify E. coli. Results are qualitative (positive or negative) and typically available within 24–72 hours.

What a Positive Result Means

A positive result indicates raw milk contains E. coli. This means the milk may not be safe to drink or use in recipes without further processing (e.g., pasteurization). Follow your healthcare provider’s advice on disposal or alternative sources of milk.

What a Negative Result Means

A negative result suggests raw milk tested negative for E. coli, but it does not guarantee complete safety. Other bacteria or pathogens may still be present. If you’re pregnant, immunocompromised, or at high risk, consider pasteurized milk instead.