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Snakebite

life science Maturity 11-13 Next article →

A snakebite is an injury caused by a snake's teeth. While many snakes use constriction to squeeze prey, venomous snakes use specialized toxins to hunt or defend themselves.

Snake Venom Delivery System Diagram
Snake Venom Delivery System Diagram

When a venomous snake bites, it often leaves two distinct puncture wounds from its fangs. This process is called envenomation if the snake injects its venom into the victim. The severity of the injury depends on many factors. These include the snake species, the amount of venom injected, the bite location, and the person's overall health.

Snake bite symptoms
Snake bite symptoms

Venom delivery is a complex biological process. Snakes can actually control how much venom they release, a behavior known as venom metering. This allows them to deliver a "dry bite," which is a bite without venom.

Snake Venom Delivery System Diagram
Snake Venom Delivery System Diagram

This strategy helps the snake save its precious resources. For example, about 80 percent of bites from sea snakes are dry bites. In contrast, only about 25 percent of pit viper bites are dry. Some snakes, like rattlesnakes, can even regulate the amount of venom they inject internally. This means the chemical impact on a human can vary significantly from one bite to the next.

Different types of venom attack the body in very different ways. Elapids, such as cobras, mambas, and sea snakes, often possess neurotoxic venom. Neurotoxicity means the toxins attack the nervous system. This can lead to blurred vision, difficulty speaking, or paresthesia, which is a tingling sensation. If untreated, neurotoxicity can cause respiratory failure because the person cannot breathe. Other snakes, like many vipers, produce venom that causes necrosis. Necrosis is the death of body tissue, such as skin or muscle.

Tissue necrosis following bite from Bothrops asper PLoS Medicine
Tissue necrosis following bite from Bothrops asper PLoS Medicine

This can lead to rhabdomyolysis, where muscle tissue breaks down. This process can cause kidney injury because the broken-down muscle parts clog the kidneys.

Snakebites are categorized by the specific physiological effects they cause. Some venoms cause coagulopathy, which is a problem with how the blood clots. This can lead to spontaneous bleeding from the mouth, nose, or even old wounds. Other venoms focus on the circulatory system or the respiratory system. Some species, like spitting cobras, can even spray venom into a person's eyes. This causes immediate pain and can lead to blindness. Even non-venomous snakes can cause injury. Large constrictors can cause deep lacerations or skin tears with their sharp, curved teeth.

Global health organizations track snakebites as a major medical concern. The World Health Organization (WHO) calls snakebites a "neglected public health issue" in tropical and subtropical regions. In 2017, the WHO classified snakebite envenomation as a Neglected Tropical Disease. This classification aims to increase research and improve the availability of antivenom. Antivenom is a medicine used to neutralize the effects of venom. However, antivenoms can have side effects and must be specific to the type of snake involved. In many parts of the world, the high cost and low availability of the correct antivenom make treatment very difficult.

Statistics show that snakebites affect millions of people every year. The WHO estimates that between 4.5 and 5.4 million people are bitten annually. About 40 to 50 percent of these people develop a clinical illness. The annual death toll is estimated to be between 80,000 and 130,000 people. Most bites occur in Africa, Asia, and Latin America, particularly in rural areas. The United States sees much lower numbers. In the U.S., about 7,000 to 8,000 people are bitten by venomous snakes each year. Only about five people die annually in the United States from these injuries.

Understanding the risks can help prevent dangerous encounters. Most bites occur on the hands, arms, or legs. People are often bitten while working in farming, forestry, or construction. In the United States, many bites happen to people keeping snakes as pets. To stay safe, experts recommend wearing protective footwear and avoiding areas where snakes live. If a bite occurs, you should wash the wound with soap and water and keep the limb still. You should never use a tourniquet, cut the wound, or try to suck out the venom. Proper medical care and timely antivenom are the most important steps for survival.

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🖼️ Images & Media (7)
File:Snake bite symptoms.png
Snake bite symptoms.png
File:Tissue necrosis following bite from Bothrops asper PLoS Medicine.jpg
Tissue necrosis following bite from...
File:RodriguezParkHoustonSnakes.JPG
RodriguezParkHoustonSnakes.JPG
File:Bundesarchiv Bild 135-KA-01-019, Tibetexpedition, Melken einer Schlange.jpg
Bundesarchiv Bild 135-KA-01-019,...
File:Snakebite kit.jpg
Snakebite kit.jpg
File:Snake Venom Delivery System Diagram.jpg
Snake Venom Delivery System Diagram.jpg
File:Benczur-kleopatra.jpg
Benczur-kleopatra.jpg
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