Kimberly Chapin, Lifespan (image) Lifespan Caption A study led by Kimberly Chapin, M.D., of the microbiology lab at the Lifespan hospitals has found that some lab tests are much more accurate in identifying Clostridium difficile Toxin (C. diff) infection (CDI), which causes diarrhea. The findings indicate that a molecular method detects up to 50 percent more cases of C. diff than other methods. Credit Lifespan Usage Restrictions With name and credit. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.