Swabs are taken for culturing and analysis of bacterial and fungal infections. Sensitivity and resistance results are also included. The swab can be used for culturing stool, skin, urine, or any other body parts or secretions. This test is highly recommended for patients with GI symptoms who have had negative stool tests for parasites, as the symptoms for pathogenic bacteria are very similar to those of parasitic infections. See a new publication by Dr. Omar M. Amin,"The Contribution of Pathogenic Bacteria to GI symptoms in Parasite-free patients" in the Journal of Bacteriology and Parasitology. View another publication re: IBS in the New England Journal of Medicine stating that up to 20% of all IBS cases are due to "gut flora".