MicrobeWorld

This is an image of Clostridium difficile colonies grown on cycloserine mannitol agar after 48 hours.

C. difficile, an anaerobic gram-positive rod, is the most frequently identified cause of Antibiotic-Associated Diarrhea (AAC). It accounts for approximately 15-25% of all episodes of AAC.

Thanks to the CDC's PHIL for this image.