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{{about|the disease|the physiological use of the term|tetanic contraction}}

Tetanus, also known as lockjaw, is a bacterial infection characterized by muscle spasms. In the most common type, the spasms begin in the jaw and then progress to the rest of the body. Each spasm usually lasts a few minutes and spasms occur frequently for three to four weeks. Spasms may be severe enough to cause bone fractures. Other symptoms of tetanus may include fever, sweating, headache, trouble swallowing, high blood pressure, and a fast heart rate.WEB, Tetanus Symptoms and Complications,weblink, 12 February 2015, January 9, 2013, no,weblink" title="">weblink 12 February 2015, Onset of symptoms is typically three to twenty-one days following infection. Recovery may take months. About ten percent of cases prove fatal.BOOK, Atkinson, William, Tetanus Epidemiology and Prevention of Vaccine-Preventable Diseases, May 2012, Public Health Foundation, 9780983263135, 291–300, 12,weblink 12 February 2015, no,weblink" title="">weblink February 13, 2015, {{CDC}}Tetanus is caused by an infection with the bacterium Clostridium tetani, which is commonly found in soil, saliva, dust, and manure.WEB, Tetanus Causes and Transmission,weblink, 12 February 2015, January 9, 2013, no,weblink" title="">weblink 12 February 2015, The bacteria generally enter through a break in the skin such as a cut or puncture wound by a contaminated object. They produce toxins that interfere with normal muscle contractions.WEB, Tetanus For Clinicians,weblink, 12 February 2015, January 9, 2013, no,weblink" title="">weblink 12 February 2015, Diagnosis is based on the presenting signs and symptoms. The disease does not spread between people.Tetanus can be prevented by immunization with the tetanus vaccine. In those who have a significant wound and have had less than three doses of the vaccine, both vaccination and tetanus immune globulin are recommended. The wound should be cleaned and any dead tissue should be removed. In those who are infected, tetanus immune globulin or, if unavailable, intravenous immunoglobulin (IVIG) is used. Muscle relaxants may be used to control spasms. Mechanical ventilation may be required if a person's breathing is affected.Tetanus occurs in all parts of the world but is most frequent in hot and wet climates where the soil contains a lot of organic matter. In 2015 there were about 209,000 infections and about 59,000 deaths globally.JOURNAL, ((GBD 2015 Disease and Injury Incidence and Prevalence Collaborators)), Global, regional, and national incidence, prevalence, and years lived with disability for 310 diseases and injuries, 1990-2015: a systematic analysis for the Global Burden of Disease Study 2015, Lancet, 388, 10053, 1545–1602, October 2016, 27733282, 5055577, 10.1016/S0140-6736(16)31678-6, JOURNAL, ((GBD 2015 Mortality and Causes of Death Collaborators)), Global, regional, and national life expectancy, all-cause mortality, and cause-specific mortality for 249 causes of death, 1980-2015: a systematic analysis for the Global Burden of Disease Study 2015, Lancet, 388, 10053, 1459–1544, October 2016, 27733281, 5388903, 10.1016/S0140-6736(16)31012-1, This is down from 356,000 deaths in 1990.JOURNAL, GBD 2013 Mortality and Causes of Death, Collaborators, Global, regional, and national age-sex specific all-cause and cause-specific mortality for 240 causes of death, 1990-2013: a systematic analysis for the Global Burden of Disease Study 2013., Lancet, 17 December 2014, 25530442, 10.1016/S0140-6736(14)61682-2, 385, 9963, 117–71, 4340604, Description of the disease by Hippocrates exists from at least as far back as the 5th century BC. The cause of the disease was determined in 1884 by Antonio Carle and Giorgio Rattone at the University of Turin, and a vaccine was developed in 1924.

Signs and symptoms

Tetanus often begins with mild spasms in the jaw muscles—also known as lockjaw or trismus. The spasms can also affect the facial muscles resulting in an appearance called risus sardonicus. Chest, neck, back, abdominal muscles, and buttocks may be affected. Back muscle spasms often cause arching, called opisthotonos. Sometimes the spasms affect muscles that help with breathing, which can lead to breathing problems.Prolonged muscular action causes sudden, powerful, and painful contractions of muscle groups, which is called "tetany". These episodes can cause fractures and muscle tears. Other symptoms include fever, headache, restlessness, irritability, feeding difficulties, breathing problems, burning sensation during urination, urinary retention and loss of stool control.BOOK, Nelson Textbook of Pediatrics, Arnon, Stephen S., Elsevier, 2016, 9781455775668, 1432, Chapter 211: Tetanus (Clostridium tetani), Even with treatment, about 10% of people who contract tetanus die. The mortality rate is higher in unvaccinated people and people over 60 years of age.

Incubation period

The incubation period of tetanus may be up to several months, but is usually about ten days.JOURNAL, Vandelaer J, Birmingham M, Gasse F, Kurian M, Shaw C, Garnier S, Tetanus in developing countries: an update on the Maternal and Neonatal Tetanus Elimination Initiative, Vaccine, 21, 24, 3442–5, July 2003, 12850356, 10.1016/S0264-410X(03)00347-5, JOURNAL, Brauner JS, Vieira SR, Bleck TP, Changes in severe accidental tetanus mortality in the ICU during two decades in Brazil, Intensive Care Med, 28, 7, 930–5, July 2002, 12122532, 10.1007/s00134-002-1332-4, In general, the farther the injury site is from the central nervous system, the longer the incubation period. The shorter the incubation period, the more severe the symptoms.JOURNAL, Farrar JJ, Yen LM, Cook T, Fairweather N, Binh N, Parry J, Parry CM, Tetanus, J. Neurol. Neurosurg. Psychiatry, 69, 3, 292–301, September 2000, 10945801, 1737078, 10.1136/jnnp.69.3.292, In neonatal tetanus, symptoms usually appear from 4 to 14 days after birth, averaging about 7 days. On the basis of clinical findings, four different forms of tetanus have been described.

Generalized tetanus

Generalized tetanus is the most common type of tetanus, representing about 80% of cases. The generalized form usually presents with a descending pattern. The first sign is trismus, or lockjaw, and the facial spasms called risus sardonicus, followed by stiffness of the neck, difficulty in swallowing, and rigidity of pectoral and calf muscles. Other symptoms include elevated temperature, sweating, elevated blood pressure, and episodic rapid heart rate. Spasms may occur frequently and last for several minutes with the body shaped into a characteristic form called opisthotonos. Spasms continue for up to four weeks, and complete recovery may take months.

Neonatal tetanus

Neonatal tetanus is a form of generalized tetanus that occurs in newborns, usually those born to mothers who themselves have not been vaccinated. If the mother has been vaccinated against tetanus, the infants acquire passive immunity and are thus protected.WEB,weblink Tetanus and neonatal tetanus (NT), WHO Western Pacific Region, no,weblink" title="">weblink 2014-05-03, It usually occurs through infection of the unhealed umbilical stump, particularly when the stump is cut with a non-sterile instrument. As of 1998 neonatal tetanus was common in many developing countries and was responsible for about 14% (215,000) of all neonatal deaths.WEB, Maternal and Neonatal Tetanus Elimination by 2005, November 2000, UNICEF,weblink 2007-01-26, no,weblink" title="">weblink 2007-01-11, In 2010 the worldwide death toll was 58,000 newborns. As the result of a public health campaign, the death toll from neonatal tetanus was reduced by 90% between 1990 and 2010, and by 2013 the disease had been largely eliminated from all but 25 countries.WEB,weblink Elimination of Maternal and Neonatal Tetanus, UNICEF, 17 February 2014, no,weblink" title="">weblink 21 February 2014, Neonatal tetanus is rare in developed countries.

Local tetanus

Local tetanus is an uncommon form of the disease, in which people have persistent contraction of muscles in the same anatomic area as the injury. The contractions may persist for many weeks before gradually subsiding. Local tetanus is generally milder; only about 1% of cases are fatal, but it may precede the onset of generalized tetanus.{{Citation needed|date=September 2012}}

Cephalic tetanus

Cephalic tetanus is the rarest form of the disease (0.9–3% of cases)JOURNAL, Doshi A, Warrell C, Dahdaleh D, Kullmann D, Just a graze? Cephalic tetanus presenting as a stroke mimic, Pract Neurol, 14, 1, 39–41, February 2014, 24052566, 10.1136/practneurol-2013-000541, and is limited to muscles and nerves in the head.JOURNAL, Del Pilar Morales E, Bertrán Pasarell J, Cardona Rodriguez Z, Almodovar Mercado JC, Figueroa Navarro A, Cephalic tetanus following penetrating eye trauma: a case report, Bol Asoc Med P R, 106, 2, 25–9, 2014, 25065047, It usually occurs after trauma to the head area, including skull fracture,JOURNAL, Adeleye, A. O., Azeez, A. L., October 2012, Fatal tetanus complicating an untreated mild open head injury: a case-illustrated review of cephalic tetanus, Surg Infect (Larchmt), 13, 5, 317–20, 10.1089/sur.2011.023, 23039234, laceration, eye injury, dental extraction,JOURNAL, Ajayi E, Obimakinde O, Cephalic tetanus following tooth extraction in a Nigerian woman, J Neurosci Rural Pract, 2, 2, 201–2, July 2011, 21897694, 3159367, 10.4103/0976-3147.83597, and otitis media,JOURNAL, Ugwu GI, Okolugbo NE, Otogenic tetanus: case series, West Afr J Med, 31, 4, 277–9, 2012, 23468033, but it has been observed from injuries to other parts of the body.JOURNAL, Kwon JC, Park Y, Han ZA, Song JE, Park HS, Trismus in cephalic tetanus from a foot injury, Korean J. Intern. Med., 28, 1, 121, January 2013, 23346010, 3543954, 10.3904/kjim.2013.28.1.121, Paralysis of the facial nerve is most frequently implicated, which may cause lockjaw, facial palsy, or ptosis, but other cranial nerves can also be affected.JOURNAL, Seo DH, Cho DK, Kwon HC, Kim TU, A case of cephalic tetanus with unilateral ptosis and facial palsy, Ann Rehabil Med, 36, 1, 167–70, February 2012, 22506253, 3309317, 10.5535/arm.2012.36.1.167, Cephalic tetanus may progress to a more generalized form of the disease. Due to its rarity, clinicians may be unfamiliar with the clinical presentation and may not suspect tetanus as the illness. Treatment can be complicated as symptoms may be concurrent with the initial injury that caused the infection. Cephalic tetanus is more likely than other forms of tetanus to be fatal, with the progression to generalized tetanus carrying a 15–30% case fatality rate.


File:Clostridium Tetani.svg|thumb|Clostridium tetani is durable due to its endosporeendosporeTetanus is caused by the tetanus bacterium Clostridium tetani. Tetanus is an international health problem, as C. tetani endospores are ubiquitous. Endospores can be introduced into the body through a puncture wound (penetrating trauma). Due to C. tetani being an anaerobic bacterium, it and its endospores thrive in environments that lack oxygen, such as a puncture wound.The disease occurs almost exclusively in persons inadequately immunized.BOOK,weblink Baron's Medical Microbiology, Univ of Texas Medical Branch, 1996, 978-0-9631172-1-2, Clostridia: Sporeforming Anaerobic Bacilli, Wells CL, Wilkins TD, Baron S, no,weblink" title="">weblink 2009-02-06, It is more common in hot, damp climates with soil rich in organic matter. Manure-treated soils may contain spores, as they are widely distributed in the intestines and feces of many animals such as horses, sheep, cattle, dogs, cats, rats, guinea pigs, and chickens. In agricultural areas, a significant number of human adults may harbor the organism.The spores can also be found on skin surfaces and in contaminated heroin. Heroin users, particularly those that inject the drug subcutaneously, appear to be at high risk of contracting tetanus. Rarely, tetanus can be contracted through surgical procedures, intramuscular injections, compound fractures, and dental infections. Animal bites can transmit tetanus.Tetanus is often associated with rust, especially rusty nails. Although rust itself does not cause tetanus, objects that accumulate rust are often found outdoors or in places that harbor anaerobic bacteria. Additionally, the rough surface of rusty metal provides a habitat for C. tetani, while a nail affords a means to puncture skin and deliver endospores deep within the body at the site of the wound.WEB,weblink Causes of Tetanus, HowStuffWorks, Edmonds, Molly, 9 November 2015, no,weblink" title="">weblink 22 November 2015, An endospore is a non-metabolizing survival structure that begins to metabolize and cause infection once in an adequate environment. Hence, stepping on a nail (rusty or not) may result in a tetanus infection, as the low-oxygen (anaerobic) environment may exist under the skin, and the puncturing object can deliver endospores to a suitable environment for growth.WEB,weblink Tetanus, Todar, Kenneth, University of Wisconsin, Madison - Dept. of Bacteriology, Lectures in Microbiology, yes,weblink" title="">weblink 2013-03-11, It is a common misconception that rust itself is the cause and that a puncture from a rust-free nail is not a risk.{{Citation |url= |title=The Claim: Stepping on a Rusty Nail Can Cause Tetanus |first=Anahad |last=O'Connor |date=February 22, 2005 |newspaper=The New York Times }}BOOK, Jennings K, Because I Said So!: The Truth Behind the Myths, Tales, and Warnings Every Generation Passes Down to Its Kids,weblink 2013-10-08, Simon and Schuster, 978-1-4767-0696-2, 13–,


Tetanus affects skeletal muscle, a type of striated muscle used in voluntary movement. The other type of striated muscle, cardiac, or heart muscle, cannot be tetanized because of its intrinsic electrical properties.The tetanus toxin initially binds to peripheral nerve terminals. It is transported within the axon and across synaptic junctions until it reaches the central nervous system. There it becomes rapidly fixed to gangliosides at the presynaptic inhibitory motor nerve endings, and is taken up into the axon by endocytosis. The effect of the toxin is to block the release of inhibitory neurotransmitters glycine and gamma-aminobutyric acid (GABA) across the synaptic cleft, which is required to check the nervous impulse. If nervous impulses cannot be checked by normal inhibitory mechanisms, the generalized muscular spasms characteristic of tetanus are produced. The toxin appears to act by selective cleavage of a protein component of synaptic vesicles, synaptobrevin II, and this prevents the release of neurotransmitters by the cells.{{Citation needed|date=March 2016}}


There are currently no blood tests for diagnosing tetanus. The diagnosis is based on the presentation of tetanus symptoms and does not depend upon isolation of the bacterium, which is recovered from the wound in only 30% of cases and can be isolated from people without tetanus. Laboratory identification of C. tetani can be demonstrated only by production of tetanospasmin in mice. Having recently experienced head trauma may indicate cephalic tetanus if no other diagnosis has been made.The "spatula test" is a clinical test for tetanus that involves touching the posterior pharyngeal wall with a soft-tipped instrument and observing the effect. A positive test result is the involuntary contraction of the jaw (biting down on the "spatula") and a negative test result would normally be a gag reflex attempting to expel the foreign object. A short report in The American Journal of Tropical Medicine and Hygiene states that, in a affected subject research study, the spatula test had a high specificity (zero false-positive test results) and a high sensitivity (94% of infected people produced a positive test).JOURNAL, Short Report: The Spatula Test: A Simple Bedside Test to Diagnose Tetanus, Apte NM, Karnad DR, October 1995, 53, 4, American Journal of Tropical Medicine and Hygiene, 386–7, 7485691,weblink no,weblink" title="">weblink 2008-02-15, 10.4269/ajtmh.1995.53.386,


Unlike many infectious diseases, recovery from naturally acquired tetanus does not usually result in immunity to tetanus. This is due to the extreme potency of the tetanospasmin toxin. Tetanospasmin will likely be lethal before it will provoke an immune response.Tetanus can be prevented by vaccination with tetanus toxoid.JOURNAL, Hopkins, A., Diphtheria, tetanus, and pertussis: recommendation for vaccine use and other preventive measures. Recommendations of the Immunization Practices Advisory committee (ACIP), MMWR Recomm Rep, 40, RR–10, 1–28, 1991, 1865873, 10.1542/peds.2006-0692, T., R., B., Lahiri, Salerno, Heath, The CDC recommends that adults receive a booster vaccine every ten years, and standard care practice in many places is to give the booster to any person with a puncture wound who is uncertain of when he or she was last vaccinated, or if he or she has had fewer than three lifetime doses of the vaccine. The booster may not prevent a potentially fatal case of tetanus from the current wound, however, as it can take up to two weeks for tetanus antibodies to form.JOURNAL, Porter JD, Perkin MA, Corbel MJ, Farrington CP, Watkins JT, Begg NT, Lack of early antitoxin response to tetanus booster, Vaccine, 10, 5, 334–6, 1992, 1574917, 10.1016/0264-410X(92)90373-R, In children under the age of seven, the tetanus vaccine is often administered as a combined vaccine, DPT/DTaP vaccine, which also includes vaccines against diphtheria and pertussis. For adults and children over seven, the Td vaccine (tetanus and diphtheria) or Tdap (tetanus, diphtheria, and acellular pertussis) is commonly used.The World Health Organization certifies countries as having eliminated maternal or neonatal tetanus. Certification requires at least two years of rates of less than 1 case per 1000 live births. In 1998 in Uganda, 3,433 tetanus cases were recorded in newborn babies; of these, 2,403 died. After a major public health effort, Uganda in 2011 was certified as having eliminated tetanus.WEB,weblink Uganda announces elimination of Maternal and Neonatal Tetanus, 2011-07-14, no,weblink" title="">weblink 2015-02-11,

Post-exposure prophylaxis

Tetanus toxoid can be given in case of a suspected exposure to tetanus. In such cases, it can be given with or without tetanus immunoglobulin (also called tetanus antibodies or tetanus antitoxin). It can be given as intravenous therapy or by intramuscular injection.The guidelines for such events in the United States for non-pregnant people 11 years and older are as follows:{| class="wikitable"! Vaccination status !! Clean, minor wounds !! All other woundsTdap and recommend catch-up vaccination >| Tdap and recommend catch-up vaccination Tetanus immunoglobulin| 3 or more doses of tetanus toxoid containing vaccine AND less than 5 years since last dose No indication No indication| 3 or more doses of tetanus toxoid containing vaccine AND 5–10 years since last dose No indication Tdap preferred (if not yet received) or Td| 3 or more doses of tetanus toxoid containing vaccine AND more than 10 years since last dose Tdap preferred (if not yet received) or Td Tdap preferred (if not yet received) or Td


(File:Tetanus world map-Deaths per million persons-WHO2012.svg|thumb|upright=1.3|Tetanus deaths per million persons in 2012{{legend|#ffff20|0-0}}{{legend|#ffa020|1-1}}{{legend|#ff9a20|2-3}}{{legend|#f08015|4-8}}{{legend|#e06815|9-13}}{{legend|#d85010|14-28}}{{legend|#d02010|29-151}})

Mild tetanus

Mild cases of tetanus can be treated with:WEB, World Health Organization, Current recommendations for treatment of tetanus during humanitarian emergencies,weblink Disease Control in Humanitarian Emergencies (English), WHO, 12 June 2013, no,weblink" title="">weblink 13 March 2014,

Severe tetanus

Severe cases will require admission to intensive care. In addition to the measures listed above for mild tetanus: Drugs such as diazepam or other muscle relaxants can be given to control the muscle spasms. In extreme cases it may be necessary to paralyze the person with curare-like drugs and use a mechanical ventilator.In order to survive a tetanus infection, the maintenance of an airway and proper nutrition are required. An intake of 3,500 to 4,000 calories and at least 150 g of protein per day is often given in liquid form through a tube directly into the stomach (percutaneous endoscopic gastrostomy), or through a drip into a vein (parenteral nutrition). This high-caloric diet maintenance is required because of the increased metabolic strain brought on by the increased muscle activity. Full recovery takes 4 to 6 weeks because the body must regenerate destroyed nerve axon terminals.


File:Tetanus world map - DALY - WHO2004.svg|thumb|upright=1.3|#b3b3b3|no data}}{{legend|#ffff65|≤10}}{{legend|#fff200|10-25}}{{legend|#ffdc00|25-50}}{{legend|#ffc600|50-75}}{{legend|#ffb000|75-100}}{{legend|#ff9a00|100-125}}{{legend|#ff8400|125-150}}{{legend|#ff6e00|150-200}}{{legend|#ff5800|200-250}}{{legend|#ff4200|250-500}}{{legend|#ff2c00|500-750}}{{legend|#cb0000|≥750}}(File:Tetanos.png|thumb|upright=1.3|Tetanus cases reported worldwide (1990-2004). Ranging from some (in dark red) to very few (in light yellow) (grey, no data).)In 2013 it caused about 59,000 deaths – down from 356,000 in 1990. Tetanus – in particular, the neonatal form – remains a significant public health problem in non-industrialized countries with 59,000 newborns worldwide dying in 2008 as a result of neonatal tetanus.JOURNAL, Maternal and Neonatal Tetanus Elimination Initiative, Pampers UNICEF 2010 Campaign, 2,weblink no,weblink" title="">weblink 2014-02-01, JOURNAL, Black, RE, Cousens, S, Johnson, HL, Lawn, JE, Rudan, I, Bassani, DG, Jha, P, Campbell, H, Walker, CF, Cibulskis, R, Eisele, T, Liu, L, Mathers, C, Child Health Epidemiology Reference Group of WHO and UNICEF, Global, regional, and national causes of child mortality in 2008: a systematic analysis., Lancet, Jun 5, 2010, 375, 9730, 1969–87, 10.1016/S0140-6736(10)60549-1, 20466419, In the United States, from 2000 through 2007 an average of 31 cases were reported per year. Nearly all of the cases in the United States occur in unimmunized individuals or individuals who have allowed their inoculations to lapse.


Tetanus was well known to ancient people who recognized the relationship between wounds and fatal muscle spasms.JOURNAL, Pearce JM, Notes on tetanus (lockjaw), Journal of Neurology, Neurosurgery, and Psychiatry, 60, 3, 332, 1996, 8609513, 10.1136/jnnp.60.3.332, 1073859, In 1884, Arthur Nicolaier isolated the strychnine-like toxin of tetanus from free-living, anaerobic soil bacteria. The etiology of the disease was further elucidated in 1884 by Antonio Carle and Giorgio Rattone, two pathologists of the University of Turin, who demonstrated the transmissibility of tetanus for the first time. They produced tetanus in rabbits by injecting pus from a person with fatal tetanus into their sciatic nerves.In 1891, C. tetani was isolated from a human victim by Kitasato Shibasaburō, who later showed that the organism could produce disease when injected into animals, and that the toxin could be neutralized by specific antibodies. In 1897, Edmond Nocard showed that tetanus antitoxin induced passive immunity in humans, and could be used for prophylaxis and treatment. Tetanus toxoid vaccine was developed by P. Descombey in 1924, and was widely used to prevent tetanus induced by battle wounds during World War II.


The word tetanus comes from the , which is further from the .tetanus {{webarchive|url= |date=2012-06-26 }}. Collins English Dictionary - Complete & Unabridged 11th Edition. Retrieved October 01, 2012

See also




External links

{hide}Medical condition classification and resources
| ICD10 = {{ICD10|A|33||a|30{edih}-{{ICD10|A|35||a|30}}
| ICD9 = {{ICD9|037}}, {{ICD9|771.3}}
| ICDO =
| OMIM =
| MedlinePlus = 000615
| eMedicineSubj = emerg
| eMedicineTopic = 574
| DiseasesDB = 2829
| MeshID = D013742
}}{{offline|med}}{{Commons}} {{Gram-positive bacterial diseases}}{{Authority control}}

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