Which of the following statements concerning clostridia is LEAST correct?
A. Pathogenic clostridia are found both in the soil and as part of the normal flora of the colon
B. Antibiotic-induced diarrhea and pseudomembranous colitis are due to toxins produced by Clostridium difficile
C. Tetanus toxin blocks the release of acetylcholine, leading to flaccid paralysis
D. Tetanus can result from infection of the umbilical stump
E. Most pathogenic clostridia are strict anaerobes, and the vegetative cells are
readily killed by oxygen
Answer. C, refers to C. botulinum