Rabbit Anti-C. tetani Toxin Polyclonal antibody for ELISA, WB. Tetanus toxin is an extremely potent neurotoxin produced by the vegetative cell of Clostridium tetani in anaerobic conditions, causing tetanus. It has no known function for clostridia in the soil environment where they are normally encountered. It is also called spasmogenic toxin, tetanospasmin or abbreviated to TeTx or TeNT. The LD50 of this toxin has been measured to be approximately 1ng/kg, making it second only to Botulinin toxin D as the deadliest toxin in the world. However, these tests are conducted solely on mice which may react differently to certain toxins than humans and other animals. C. tetani also produces the exotoxin tetanolysin, a hemolysin, that causes destruction of tissues.