Which of the following is non-motile?: (A) C histolyticum, (B) C perfringens, (C) C ramosum, (D) C.botulinum
Answer is B. Clostridia are Gram positive, obligate anaerobes , spore forming (bulging) bacilli. All are motile by peritrichous flagellae except Cl.perfringens and Cl.tetani type VI. Motility - 'stately' They are noncapsulated except C. perfringens and C. butyricum.