{
 "topic": "Tetanus",
 "slug": "tetanus",
 "category_id": 15790,
 "summary": "Clostridium tetani pathophysiology and the four clinical forms of tetanus, plus wound-based prophylaxis rules and treatment with TIG and antibiotics.",
 "written_by": "claude-sonnet",
 "references": [
  {
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 ],
 "short": [
  {
   "title": "In short",
   "content": "- Tetanus is caused by tetanospasmin, a neurotoxin from Clostridium tetani, an anaerobic, gram-positive, spore-forming bacillus ubiquitous in soil and in human/animal intestines; the organism itself is non-invasive and multiplies locally in contaminated (especially devitalized, deep-puncture) wounds.\n- Toxin travels to the CNS by retrograde axonal transport, binds cerebral gangliosides, and blocks inhibitory spinal synapses, producing intense, uncontrolled muscle spasms.\n- Four overlapping clinical forms: generalized (most common in children), local (spasms near the wound only), cephalic (cranial nerve dysfunction, from head/neck wounds), and neonatal (generalized tetanus in a newborn lacking maternal passive immunity, typically from umbilical cord contamination).\n- Incubation period is typically 4\u201314 days (ranges cited 2\u201321 days, rarely up to months); most cases occur within about 8\u201314 days of the wound.\n- Generalized tetanus: trismus (masseter spasm/lockjaw) is the presenting symptom in about half of cases, often preceded by headache, restlessness, and irritability; progression includes risus sardonicus (sardonic smile from facial/buccal muscle spasm) and, in severe cases, opisthotonos (rigid arched hyperextension of the body). Autonomic dysfunction (diaphoresis, tachycardia, labile blood pressure, arrhythmias) is common. Severe spasms persist \u22651 week and resolve over several weeks in survivors.\n- Two-thirds of US cases follow minor puncture wounds of the hands or feet; in many cases no wound history can even be obtained. US pediatric cases occur almost exclusively in unvaccinated or inadequately vaccinated children.\n- Diagnosis is entirely clinical \u2014 bacterial culture yield from the wound is poor. Differential diagnosis includes hypocalcemia and certain drug reactions.\n- Treatment: tetanus immune globulin (TIG), part infiltrated around the wound and the remainder given IM, plus metronidazole (preferred) or penicillin for 10\u201314 days.\n- Neonatal tetanus remains a major cause of death in developing countries (estimated 250,000+ deaths worldwide per year in the early 2000s; historically ~60,000\u2013200,000 neonatal deaths yearly), while US disease is now rare (\u226440 cases/year in some periods) because of widespread active immunization.\n- Wound management follows a tetanus-prophylaxis table based on immunization history and wound type (clean/minor vs. all other wounds): unknown or fewer-than-3 prior toxoid doses require both a tetanus-containing vaccine and TIG for non-clean wounds; with 3+ prior doses, a booster vaccine is given only if \u226510 years (clean wounds) or \u22655 years (other wounds) have passed since the last dose, and TIG is not needed."
  }
 ],
 "long": [
  {
   "title": "Definition",
   "content": "Tetanus is an acute, toxin-mediated illness caused by Clostridium tetani, an anaerobic, gram-positive, spore-forming, motile bacillus found in soil and in human and animal intestinal flora. The organism itself is non-invasive; its spores remain nonpathogenic until wound conditions (anaerobic, often with devitalized tissue) allow germination and toxin (tetanospasmin) production. Disease occurs in four overlapping clinical forms: generalized (widespread toxin distribution, the most common form in children), local (spasms confined to muscles near the wound, which can progress to generalized disease), cephalic (cranial nerve dysfunction following head or neck wounds), and neonatal (generalized tetanus in newborns lacking protective passive immunity because their mothers are not immune, usually from umbilical cord contamination)."
  },
  {
   "title": "Epidemiology",
   "content": "Tetanus occurs worldwide and is more common in warmer climates and warmer months, reflecting a higher frequency of contaminated wounds in those settings. In the United States, tetanus in children is rare, with the highest incidence among people living on farms; US pediatric cases occur almost exclusively because of failure to immunize. Globally, the picture is very different: neonatal tetanus has historically killed an estimated 60,000\u2013250,000 or more infants yearly in developing countries where maternal immunization and sterile umbilical cord care are inadequate. Successful national immunization programs can eliminate the disease \u2014 India, for example, went from an estimated 80,000 neonatal tetanus deaths in 1990 to fewer than 500 reported cases in 2015, meeting the WHO elimination threshold of under 1 neonatal tetanus case per 1000 live births in every district."
  },
  {
   "title": "Pathophysiology",
   "content": "C. tetani multiplies locally within a contaminated wound under anaerobic conditions, particularly wounds with devitalized tissue or deep puncture trauma. The organism itself does not invade tissue; instead it elaborates tetanospasmin, which travels to the central nervous system via retrograde axonal transport. Once there, the toxin binds cerebral gangliosides and blocks the function of inhibitory synapses in the spinal cord, increasing reflex excitability of motor neurons. The net effect is loss of the normal inhibitory control over motor reflexes, producing intense, sustained muscle spasms that can be triggered or worsened by any external stimulus."
  },
  {
   "title": "Clinical features",
   "content": "The incubation period is typically 4\u201314 days (ranges of 2\u201321 days, and rarely months, are described), with most cases occurring within about 8\u201314 days of the inciting wound; the portal of entry is often a seemingly trivial wound, and in many cases no wound history can be elicited at all. In generalized tetanus, onset is gradual over 1\u20137 days. Trismus (masseter muscle spasm, \"lockjaw\") is the presenting symptom in about half of cases, sometimes preceded by headache, restlessness, and irritability, and followed by neck stiffness, difficulty chewing, and dysphagia. Spasm of the facial and buccal muscles produces the classic risus sardonicus (\"sardonic smile\"). As spasm extends to abdominal, lumbar, hip, and thigh muscles, patients can develop opisthotonos \u2014 a rigid, arched hyperextension of the body with only the back of the head and heels touching the surface, from unrelenting contraction of opposing muscle groups. Autonomic dysfunction \u2014 diaphoresis, tachycardia, labile blood pressure, and arrhythmias \u2014 is common. Severe spasms persist for a week or more and, in survivors, subside gradually over several weeks. Local tetanus produces spasm confined to muscles near the wound and can progress to the generalized form; cephalic tetanus follows head/neck wounds with cranial nerve dysfunction. Two-thirds of US cases follow minor puncture wounds of the hands or feet."
  },
  {
   "title": "Diagnostics",
   "content": "Tetanus is a clinical diagnosis; wound culture yield for C. tetani is poor and should not be relied upon to confirm or exclude the diagnosis. The differential diagnosis for the spasms of tetanus includes hypocalcemia and certain drug reactions, which should be considered and excluded based on history and basic laboratory testing."
  },
  {
   "title": "Treatment",
   "content": "Treatment centers on neutralizing unbound toxin and eradicating the organism. Tetanus immune globulin (TIG) is given, with part of the dose infiltrated around the wound and the remainder administered intramuscularly. Antimicrobial therapy \u2014 metronidazole (preferred) or penicillin \u2014 is given for 10\u201314 days. Wound care (debridement of devitalized tissue) supports source control by removing the anaerobic environment the organism needs to multiply."
  }
 ],
 "clinical": [
  {
   "title": "Wound management and prophylaxis",
   "content": "For any wound presentation, ask directly about the patient's tetanus vaccination history rather than assuming it is up to date \u2014 this determines whether a tetanus-containing vaccine (DTaP, Tdap, or Td) and/or TIG are needed, and the decision differs for clean, minor wounds versus all other wounds. If the patient has had fewer than 3 prior tetanus toxoid doses (or the history is unknown), give a tetanus-containing vaccine for any wound, and add TIG for any wound that is not clean and minor. If the patient has had 3 or more prior doses, a booster vaccine (but not TIG) is needed only if it has been 10 or more years since the last dose for a clean, minor wound, or 5 or more years since the last dose for any other wound; TIG is not indicated in a fully immunized patient regardless of wound type.\n\nFor a patient with a confirmed or suspected active tetanus infection, give TIG (part infiltrated around the wound, the remainder IM) plus metronidazole (preferred) or penicillin for 10\u201314 days, and thoroughly debride the wound of devitalized tissue to eliminate the anaerobic environment the organism requires. Manage muscle spasms and autonomic instability supportively, and anticipate a prolonged course \u2014 severe spasms typically persist for a week or more and resolve gradually over several weeks in survivors, so plan supportive care (including airway protection, given the risk from laryngospasm and generalized spasm) accordingly. In a newborn presenting with poor feeding and generalized rigidity/spasm, especially in a setting of inadequate maternal immunization or nonsterile umbilical cord care, consider neonatal tetanus and manage the umbilical stump as the presumed portal of entry."
  }
 ]
}