Clinicians often consider green poop to be a sign of C. diff. However, in a 2019 study, researchers assessed the stool colors of people with C. diff infections and found no statistically significant correlation between C. diff infections and a person’s poop color.
The researchers did note that the study's sample size was small and that they had not considered other factors, such as diet.
Symptomatic CDI can also cause stools to be liquid and have a strong, distinctive odor.