Clostridium tetani is a gram-positive, motile bacteria that forms terminal spores giving it a drumstick appearance. It produces a potent neurotoxin called tetanospasmin which binds to synaptic membranes in the central nervous system, blocking the release of inhibitory neurotransmitters and causing painful muscle spasms. The neurotoxin is responsible for the clinical manifestations of tetanus such as lockjaw, risus sardonicus, and opisthotonos. Treatment involves wound debridement, controlling spasms, antibiotics to eliminate vegetative bacteria, and passive immunity with tetanus immunoglobulin. Active vaccination provides preventative antitoxin and immunity against the disease.