The study presents a case report of a generalized form of severe tetanus in an unvaccinated 11-year-old child. Pain and convulsive syndromes, respiratory failure, and damage to the gastrointestinal tract prevailed in the acute period. Antibiotic therapy, anti-tetanus serum, adequate pain relief, and anticonvulsant therapy were the leading treatments of the child. Moreover, the paper discusses literature data on the options for the clinical course and choice of treatment strategies. The lack of planned vaccination in children is unsafe.