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A bite on a finger from a Montpellier snake
Classification and external resources
Specialty Emergency medicine
ICD-10 T63.0, T14.1, W59 (nonvenomous), X20 (venomous)
ICD-9-CM 989.5, E905.0, E906.2
DiseasesDB 29733
MedlinePlus 000031
eMedicine med/2143
MeSH D012909

A snakebite is an injury caused by the bite of a

  • WHO Snake Antivenoms Database

External links

  • Campbell, Jonathan A.; William W. Lamar (2004). The Venomous Reptiles of the Western Hemisphere. Ithaca, NY: Cornell University Press. ISBN 978-0-8014-4141-7
  • Spawls, Stephen; Bill Branch (1995). The Dangerous Snakes of Africa: Natural History, Species Directory, Venoms and Snakebite. Sanibel Island, FL: Ralph Curtis Publishing. ISBN 978-0-88359-029-4
  • Sullivan JB, Wingert WA, Norris Jr RL. (1995). North American Venomous Reptile Bites. Wilderness Medicine: Management of Wilderness and Environmental Emergencies. 3: 680–709.
  • Thorpe, Roger S.; Wolfgang Wüster, Anita Malhotra (1996). Venomous Snakes: Ecology, Evolution, and Snakebite'. Oxford, England: Oxford University Press. ISBN 978-0-19-854986-4

Further reading

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  10. ^ a b MedlinePlus - Snake bites From Tintinalli JE, Kelen GD, Stapcynski JS, eds. Emergency Medicine: A Comprehensive Study Guide. 6th ed. New York, NY: McGraw Hill; 2004. Update Date: 2/27/2008. Updated by: Stephen C. Acosta, MD, Department of Emergency Medicine, Portland VA Medical Center, Portland, OR. Review provided by VeriMed Healthcare Network. Also reviewed by David Zieve, MD, MHA, Medical Director, A.D.A.M., Inc. Retrieved on 19 mars, 2009
  11. ^ - Snake Bite First Aid – Snakebite Retrieved on 21 mars, 2009
  12. ^ Snake bite image example at MDconsult - Patient Education - Wounds, Cuts and Punctures, First Aid for
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  47. ^ Riggs BS, Smilkstein MJ, Kulig KW, et al. Rattlesnake envenomation with massive oropharyngeal edema following incision and suction (Abstract). Presented at the AACT/AAPCC/ABMT/CAPCC Annual Scientific Meeting, Vancouver, Canada, September 27 October 2, 1987.
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Snakebite as a surreptitious form of murder has been featured in stories such as Sir Arthur Conan Doyle's The Adventure of the Speckled Band, but actual occurrences are virtually unheard of, with only a few documented cases.[57][59][60] It has been suggested that Boris III of Bulgaria, who was allied to Nazi Germany during World War II, may have been killed with snake venom,[57] although there is no definitive evidence. At least one attempted suicide by snakebite has been documented in medical literature involving a puff adder bite to the hand.[61]

Historically, snakebites were seen as a means of execution in some cultures. In medieval Europe, a form of capital punishment was to throw people into snake pits, leaving people to die from multiple venomous bites. A similar form of punishment was common in Southern Han during China's Five Dynasties and Ten Kingdoms period and in India.[57] Snakebites were also used as a form of suicide, most notably by Egyptian queen Cleopatra VII, who reportedly died from the bite of an asp—likely an Egyptian cobra[56][58]—after hearing of Mark Antony's death.

Snakes were both revered and worshipped and feared by early civilizations. The ancient Egyptians recorded prescribed treatments for snakebites as early as the Thirteenth Dynasty in the Brooklyn Papyrus, which includes at least seven venomous species common to the region today, such as the horned vipers.[56] In Judaism, the Nehushtan was a pole with a snake made of copper fixed upon it. The object was considered to be a symbol of faith in God's mercy, healing bites caused by the snakes which had infested the desert, with people merely having to look upon it in order to save themselves from imminent death.

According to tradition, Cleopatra VII famously committed suicide by snakebite to her left breast, as seen in this 1911 painting by Hungarian artist Gyula Benczúr.

Society and culture

Worldwide, snakebites occur most frequently in the summer season when snakes are active and humans are outdoors.[5][53] Agricultural and tropical regions report more snakebites than anywhere else.[5][54] In the USA, those bitten are typically male and between 17 and 27 years of age.[3][53][55] Children and the elderly are the most likely to die.[3][30]

Most snakebites are caused by non-venomous snakes. Of the roughly 3,000 known species of snake found worldwide, only 15% are considered dangerous to humans.[5][3] Snakes are found on every continent except Antarctica.[5] The most diverse and widely distributed snake family, the colubrids, has approximately 700 venomous species,[52] but only five generaboomslangs, twig snakes, keelback snakes, green snakes, and slender snakes—have caused human fatalities.[52]

Estimate vary from 1.2 to 5.5 million snakebites, 421,000 to 2.5 million envenomings, and 20,000 to 125,000 deaths.[5][2] Since reporting is not mandatory in much of the world, the data on the frequency of snakebites is not precise.[5] Many people who survive bites have permanent tissue damage caused by venom, leading to disability.[8] Most snake envenomings and fatalities occur in South Asia, Southeast Asia, and sub-Saharan Africa, with India reporting the most snakebite deaths of any country.[5]


In extreme cases, in remote areas, all of these misguided attempts at treatment have resulted in injuries far worse than an otherwise mild to moderate snakebite. In worst-case scenarios, thoroughly constricting tourniquets have been applied to bitten limbs, completely shutting off blood flow to the area. By the time the person finally reached appropriate medical facilities their limbs had to be amputated.

  • Application of a tourniquet to the bitten limb is generally not recommended. There is no convincing evidence that it is an effective first-aid tool as ordinarily applied.[40] Tourniquets have been found to be completely ineffective in the treatment of Crotalus durissus bites,[41] but some positive results have been seen with properly applied tourniquets for cobra venom in the Philippines.[42] Uninformed tourniquet use is dangerous, since reducing or cutting off circulation can lead to gangrene, which can be fatal.[40] The use of a compression bandage is generally as effective, and much safer.
  • Cutting open the bitten area, an action often taken prior to suction, is not recommended since it causes further damage and increases the risk of infection; the subsequent cauterization of the area with fire or silver nitrate (also known as infernal stone) is also potentially threatening.[43]
  • Sucking out venom, either by mouth or with a pump, does not work and may harm the affected area directly.[44] Suction started after three minutes removes a clinically insignificant quantity—less than one-thousandth of the venom injected—as shown in a human study.[45] In a study with pigs, suction not only caused no improvement but led to necrosis in the suctioned area.[46] Suctioning by mouth presents a risk of further poisoning through the mouth's mucous tissues.[47] The well-meaning family member or friend may also release bacteria into the person's wound, leading to infection.
  • Immersion in warm water or sour milk, followed by the application of snake-stones (also known as la Pierre Noire), which are believed to draw off the poison in much the way a sponge soaks up water.
  • Application of a one-percent solution of potassium permanganate or chromic acid to the cut, exposed area.[43] The latter substance is notably toxic and carcinogenic.
  • Drinking abundant quantities of alcohol following the cauterization or disinfection of the wound area.[43]
  • Use of electroshock therapy in animal tests has shown this treatment to be useless and potentially dangerous.[48][49][50][51]

The following treatments, while once recommended, are considered of no use or harmful, including tourniquets, incisions, suction, application of cold, and application of electricity.[36] Cases in which these treatments appear to work may be the result of dry bites.

Old-style snake bite kit that should not be used.


Antivenom is injected into the person intravenously, and works by binding to and neutralizing venom enzymes. It cannot undo damage already caused by venom, so antivenom treatment should be sought as soon as possible. Modern antivenoms are usually polyvalent, making them effective against the venom of numerous snake species. Pharmaceutical companies which produce antivenom target their products against the species native to a particular area. Although some people may develop serious adverse reactions to antivenom, such as anaphylaxis, in emergency situations this is usually treatable and hence the benefit outweighs the potential consequences of not using antivenom. Giving adrenaline (epinephrine) to prevent adverse effect to antivenom before they occur might be reasonable where they occur commonly.[39] Antihistamines do not appear to provide any benefit in preventing adverse reactions.[39]

Until the advent of antivenom, bites from some species of snake were almost universally fatal.[38] Despite huge advances in emergency therapy, antivenom is often still the only effective treatment for envenomation. The first antivenom was developed in 1895 by French physician Albert Calmette for the treatment of Indian cobra bites. Antivenom is made by injecting a small amount of venom into an animal (usually a horse or sheep) to initiate an immune system response. The resulting antibodies are then harvested from the animal's blood.


The object of pressure immobilization is to contain venom within a bitten limb and prevent it from moving through the skeletal muscles.

As of 2008, clinical evidence for pressure immobilization via the use of an elastic bandage is limited.[34] It is recommended for snakebites that have occurred in Australia (due to elapids which are neurotoxic).[35] It is not recommended for bites from non-neurotoxic snakes such as those found in North America and other regions of the world.[35][36] The British military recommends pressure immobilization in all cases where the type of snake is unknown.[37]

A Russell's viper is being "milked". Laboratories use extracted snake venom to produce antivenom, which is often the only effective treatment for potentially fatal snakebites.

Pressure immobilization

  • Reassure the person. Seventy percent of all snakebites are from non-venomous species. Half of bites from venomous species poison the person.
  • Immobilise in the same way as a fractured limb. Use bandages or cloth to hold the splints, with care taken not to apply pressure or block the blood supply (such as with ligatures).
  • Get to a hospital immediately. Traditional remedies have no proven benefit in treating snakebite.
  • Tell the doctor of any systemic symptoms, such as droopiness of a body part, that manifest on the way to hospital.

India developed a national snake bite protocol in 2007 which includes advice to:[33]

Many organizations, including the American Medical Association and American Red Cross, recommend washing the bite with soap and water. Australian recommendations for snake bite treatment recommend against cleaning the wound. Traces of venom left on the skin/bandages from the strike can be used in combination with a snake bite identification kit to identify the species of snake. This speeds determination of which antivenom to administer in the emergency room.[32]

  1. Protect the person and others from further bites. While identifying the species is desirable in certain regions, risking further bites or delaying proper medical treatment by attempting to capture or kill the snake is not recommended.
  2. Keep the person calm. Acute stress reaction increases blood flow and endangers the person.
  3. Call for help to arrange for transport to the nearest hospital emergency room, where antivenom for snakes common to the area will often be available.
  4. Make sure to keep the bitten limb in a functional position and below the person's heart level so as to minimize blood returning to the heart and other organs of the body.
  5. Do not give the person anything to eat or drink. This is especially important with consumable alcohol, a known vasodilator which will speed up the absorption of venom. Do not administer stimulants or pain medications, unless specifically directed to do so by a physician.
  6. Remove any items or clothing which may constrict the bitten limb if it swells (rings, bracelets, watches, footwear, etc.)
  7. Keep the person as still as possible.
  8. Do not incise the bitten site.

However, most first aid guidelines agree on the following:

Snakebite first aid recommendations vary, in part because different snakes have different types of venom. Some have little local effect, but life-threatening systemic effects, in which case containing the venom in the region of the bite by pressure immobilization is desirable. Other venoms instigate localized tissue damage around the bitten area, and immobilization may increase the severity of the damage in this area, but also reduce the total area affected; whether this trade-off is desirable remains a point of controversy. Because snakes vary from one country to another, first aid methods also vary.

First aid

The three types of venomous snakes that cause the majority of major clinical problems are vipers, kraits, and cobras. Knowledge of what species are present locally can be crucial, as is knowledge of typical signs and symptoms of envenomation by each type of snake. A scoring system can be used to try to determine the biting snake based on clinical features,[31] but these scoring systems are extremely specific to particular geographical areas.

Identification of the snake is important in planning treatment in certain areas of the world, but is not always possible. Ideally the dead snake would be brought in with the person, but in areas where snake bite is more common, local knowledge may be sufficient to recognize the snake. However, in regions where polyvalent antivenoms are available, such as North America, identification of snake is not a high priority item. Attempting to catch or kill the offending snake also puts one at risk for re-envenomation or creating a second person bitten, and generally is not recommended.

Snake identification

It is not an easy task determining whether or not a bite by any species of snake is life-threatening. A bite by a North American copperhead on the ankle is usually a moderate injury to a healthy adult, but a bite to a child's abdomen or face by the same snake may be fatal. The outcome of all snakebites depends on a multitude of factors: the size, physical condition, and temperature of the snake, the age and physical condition of the person, the area and tissue bitten (e.g., foot, torso, vein or muscle), the amount of venom injected, the time it takes for the person to find treatment, and finally the quality of that treatment.[3][30]


It is also important to avoid snakes that appear to be dead, as some species will actually roll over on their backs and stick out their tongue to fool potential threats. A snake's detached head can immediately act by reflex and potentially bite. The induced bite can be just as severe as that of a live snake.[3][28] Dead snakes are also incapable of regulating the venom they inject, so a bite from a dead snake can often contain large amounts of venom.[29]

In the United States more than 40 percent of people bitten by snake intentionally put themselves in harm's way by attempting to capture wild snakes or by carelessly handling their dangerous pets—40 percent of that number had a blood alcohol level of 0.1 percent or more.[27]

The use of a flashlight when engaged in camping activities, such as gathering firewood at night, can be helpful. Snakes may also be unusually active during especially warm nights when ambient temperatures exceed 21 °C (70 °F). It is advised not to reach blindly into hollow logs, flip over large rocks, and enter old cabins or other potential snake hiding-places. When rock climbing, it is not safe to grab ledges or crevices without examining them first, as snakes are cold-blooded and often sunbathe atop rock ledges.

When in the wilderness, treading heavily creates ground vibrations and noise, which will often cause snakes to flee from the area. However, this generally only applies to vipers, as some larger and more aggressive snakes in other parts of the world, such as mambas and cobras,[26] will respond more aggressively. When dealing with direct encounters it is best to remain silent and motionless. If the snake has not yet fled it is important to step away slowly and cautiously.

Snakes are likely to approach residential areas when attracted by prey, such as rodents. Regular pest control can reduce the threat of snakes considerably. It is beneficial to know the species of snake that are common in local areas, or while travelling or hiking. Africa, Australia, the Neotropics, and southern Asia in particular are populated by many dangerous species of snake. Being aware of—and ultimately avoiding—areas known to be heavily populated by dangerous snakes is strongly recommended.

Snakes are most likely to bite when they feel threatened, are startled, are provoked, or when they have been cornered.

Sign at Sylvan Rodriguez Park in Houston, Texas warning of the presence of snakes.


The strength of venom differs markedly between species and even more so between families, as measured by median lethal dose (LD50) in mice. Subcutaneous LD50 varies by over 140-fold within elapids and by more than 100-fold in vipers. The amount of venom produced also differs among species, with the Gaboon viper able to potentially deliver from 450–600 milligrams of venom in a single bite, the most of any snake.[25] Opisthoglyphous colubrids have venom ranging from life-threatening (in the case of the boomslang) to barely noticeable (as in Tantilla).

Venom in many snakes, such as pit vipers, affects virtually every organ system in the human body and can be a combination of many toxins, including cytotoxins, hemotoxins, neurotoxins, and myotoxins, allowing for an enormous variety of symptoms.[3][24] Earlier, the venom of a particular snake was considered to be one kind only, i.e. either hemotoxic or neurotoxic, and this erroneous belief may still persist wherever the updated literature is hard to access. Although there is much known about the protein compositions of venoms from Asian and American snakes, comparatively little is known of Australian snakes.

Snake venom is produced in modified parotid glands normally responsible for secreting saliva. It is stored in structures called alveoli behind the animal's eyes, and ejected voluntarily through its hollow tubular fangs. Venom is composed of hundreds to thousands of different proteins and enzymes, all serving a variety of purposes, such as interfering with a prey's cardiac system or increasing tissue permeability so that venom is absorbed faster.

It has been suggested that snakes evolved the mechanisms necessary for venom formation and delivery sometime during the Miocene epoch.[22] During the mid-Tertiary, most snakes were large ambush predators belonging to the superfamily Henophidia, which use constriction to kill their prey. As open grasslands replaced forested areas in parts of the world, some snake families evolved to become smaller and thus more agile. However, subduing and killing prey became more difficult for the smaller snakes, leading to the evolution of snake venom.[22] Other research on Toxicofera, a hypothetical clade thought to be ancestral to most living reptiles, suggests an earlier time frame for the evolution of snake venom, possibly to the order of tens of millions of years, during the Late Cretaceous.[23]

Snake venom

While most snakes must open their mouths before biting, African and Middle Eastern snakes belonging to the family Atractaspididae are able to fold their fangs to the side of their head without opening their mouth and jab a person.[21]

Some dry bites may also be the result of imprecise timing on the snake's part, as venom may be prematurely released before the fangs have penetrated the person.[19] Even without venom, some snakes, particularly large constrictors such as those belonging to the Boidae and Pythonidae families, can deliver damaging bites; large specimens often cause severe lacerations, or the snake itself pulls away, causing the flesh to be torn by the needle-sharp recurved teeth embedded in the person. While not as life-threatening as a bite from a venomous species, the bite can be at least temporarily debilitating and could lead to dangerous infections if improperly dealt with.

Since envenomation is completely voluntary, all venomous snakes are capable of biting without injecting venom into a person. Snakes may deliver such a "dry bite" rather than waste their venom on a creature too large for them to eat, a behaviour called venom metering.[19] However, the percentage of dry bites varies among species: 80 percent of bites inflicted by sea snakes, which are normally timid, do not result in envenomation,[17] whereas only 25 percent of pit viper bites are dry.[3] Furthermore, some snake genera, such as rattlesnakes, significantly increase the amount of venom injected in defensive bites compared to predatory strikes.[20]


The type of snake that most often delivers serious bites depends on the region of the world. In Africa it is mambas, Egyptian cobras, puff adders, and carpet vipers. In the Middle East it is carpet vipers and elapids. In Central and South America it is snakes of the Bothrops and Crotalus types, the latter including rattlesnakes. In South Asia it was previously believed that Indian cobras, common kraits, Russell's viper and carpet vipers were the most dangerous; other snakes, however, may also cause significant problems in this area of the world.[18]

In the developing world most snakebites occur in those who work outside such as farmers, hunters, and fishermen. They often happen when a person steps on the snake or approaches it too closely. In the United States and Europe snakebites most commonly occur in those who keep them as pets.[18]


Venom emitted from some types of cobras, almost all vipers and some sea snakes causes necrosis of muscle tissue.[8] Muscle tissue will begin to die throughout the body, a condition known as rhabdomyolysis. Rhabdomyolysis can result in damage to the kidneys as a result of myoglobin accumulation in the renal tubules. This, coupled with hypotension, can lead to acute renal failure, and, if left untreated, eventually death.[8]

Venom emitted from elapids, including sea snakes, kraits, cobras, king cobra, mambas, and many Australian species, contain toxins which attack the nervous system, causing neurotoxicity.[3][8][17] The person may present with strange disturbances to their vision, including blurriness. Paresthesia throughout the body, as well as difficulty in speaking and breathing, may be reported.[3] Nervous system problems will cause a huge array of symptoms, and those provided here are not exhaustive. If not treated immediately they may die from respiratory failure.

Some Australian elapids and most viper envenomations will cause ecchymosis (bruising) of the skin.

Severe tissue necrosis following Bothrops asper envenomation that required amputation above the knee. The person was an 11-year-old boy, bitten two weeks earlier in Ecuador, but treated only with antibiotics.[16]

Interestingly, bites caused by the Mojave rattlesnake, kraits, coral snake, and the speckled rattlesnake reportedly cause little or no pain despite being serious injuries.[3] Those bitten may also describe a "rubbery", "minty", or "metallic" taste if bitten by certain species of rattlesnake.[3] Spitting cobras and rinkhalses can spit venom in a person's eyes. This results in immediate pain, ophthalmoparesis, and sometimes blindness.[14][15]

Most snakebites, whether by a venomous snake or not, will have some type of local effect. There is minor pain and redness in over 90 percent of cases, although this varies depending on the site.[3] Bites by vipers and some cobras may be extremely painful, with the local tissue sometimes becoming tender and severely swollen within five minutes.[8] This area may also bleed and blister and can eventually lead to tissue necrosis. Other common initial symptoms of pit viper and viper bites include lethargy, bleeding, weakness, nausea, and vomiting.[3][8] Symptoms may become more life-threatening over time, developing into hypotension, tachypnea, severe tachycardia, severe internal bleeding, altered sensorium, kidney failure, and respiratory failure.[3][8]

Clostridium tetani. Infection is often reported with viper bites whose fangs are capable of deep puncture wounds. Bites may cause anaphylaxis in certain people.

The most common symptom of all snakebites is overwhelming fear, which contributes to other symptoms, including nausea and vomiting, diarrhea, vertigo, fainting, tachycardia, and cold, clammy skin.[3][13] Television, literature, and folklore are in part responsible for the hype surrounding snakebites, and people may have unwarranted thoughts of imminent death.

The most common symptom of any kind of snake envenomation.[10][11][12] However, there is vast variation in symptoms between bites from different types of snakes.[10]

Signs and symptoms


  • Signs and symptoms 1
  • Cause 2
  • Pathophysiology 3
    • Snake venom 3.1
  • Prevention 4
  • Treatment 5
    • Snake identification 5.1
    • First aid 5.2
    • Pressure immobilization 5.3
    • Antivenom 5.4
    • Outmoded 5.5
  • Epidemiology 6
  • Society and culture 7
  • References 8
  • Further reading 9
  • External links 10

[8][9][5].North America and Europe, Australia Deaths are relatively rare in [1] About seven to eight thousand people per year in the United States are bitten by venomous snakes.[2] with rural areas more greatly affected.[2],Latin America, and Asia, Africa They occur most commonly in [5] The frequency of bites varies greatly among different parts of the world.[2][5] They result in about 2.5 million poisonings and 20,000 to 125,000 deaths.[2] The number of snakebites that occur each year may be as high as five million.[6] is sometimes also required.Supporting the person's breathing Antivenom has little effect on the area around the bite itself. [2] In some areas of the world getting the right type of antivenom is difficult and this partly contributes to why they sometimes do not work. An additional issue is the cost of these medications.[6] The type of antivenom needed depends on the type of snake involved. When the type of snake is unknown, antivenom is often given based on the types known to be in the area.[2][8] is effective at preventing death from bites; however, antivenoms frequently have side effects.Antivenom [1] is not recommended.tourniquet Trying to suck out the venom, cutting the wound with a knife, or using a [6][1] Washing the wound with soap and water and holding the limb still is recommended.[1] Prevention of snake bites can involve wearing protective footwear, avoiding areas where snakes live, and not handling snakes. Treatment partly depends on the type of snake.[7]

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