Apyretic tetanus is a medical condition characterized by muscle stiffness and spasms caused by the bacterial infection of Clostridium tetani. It is also known as non-febrile tetanus or asymptomatic tetanus. Other synonyms for apyretic tetanus include localized tetanus, which occurs when the infection is confined to one area, such as a wound, and cephalic tetanus, which affects the head and neck muscles. Another term used interchangeably with apyretic tetanus is neonatal tetanus, which affects newborn babies and is caused by the infection of the umbilical stump. Regardless of the terminology used, apyretic tetanus requires prompt medical attention and treatment to prevent potentially fatal complications.