Test Details: Campylobacter infection is diagnosed when a laboratory test detects Campylobacter bacteria in stool (poop), body tissue, or fluids. The test could be a culture that isolates the bacteria or a rapid diagnostic test that detects genetic material of the bacteria. Most people recover from Campylobacter infection without antibiotic treatment. Patients should drink extra fluids as long as diarrheal lasts. When antibiotics are necessary, healthcare providers can use laboratory tests to help determine which type of antibiotics will likely be effective.