Microbiology Bacteria 68f927f0 Botulinum affects all except: A Neuromuscular junction B Preganglionic junction C Post ganglionic nerves D CNS High-Yield Explanation Ans. is 'd' i.e., CNS(Ref: Harrison, 18th/e, p. 1200 and 17th/e, p. 901)* The central nervous system is not involved because the toxin does not cross the blood brain barrier.