Snakebite: A Global Health Emergency

Snakebite envenoming is a devastating but often overlooked global health crisis, claiming the lives of over 100,000 people annually and leaving hundreds of thousands more with permanent disabilities. While the precise figures remain elusive, it's estimated that a staggering 2.7 million individuals are bitten by venomous snakes each year. Of these, a significant proportion, around 400,000, will face the grim reality of amputation or a lifetime of other debilitating conditions. The sheer scale of this tragedy is particularly stark in regions like sub-Saharan Africa, where an estimated 20,000 lives are lost to snakebites every single year. Recognising the critical need for intervention, organisations like Médecins Sans Frontières (MSF) are actively campaigning to improve access to effective and affordable antivenom, a crucial component in saving lives and mitigating the long-term consequences of these often-fatal encounters.

The Unseen Toll: Statistics and Impact

The statistics surrounding snakebite envenoming paint a grim picture of a public health emergency that disproportionately affects vulnerable populations, often in rural and impoverished areas where access to medical care is limited. The World Health Organization (WHO) officially recognised snakebite envenoming as a neglected tropical disease (NTD) in 2017, a designation that highlights the insufficient attention and resources dedicated to combating it. The impact goes beyond immediate mortality; survivors often grapple with severe physical and psychological trauma. Amputations, nerve damage leading to paralysis, and chronic pain can render individuals unable to work, care for their families, or participate fully in their communities, perpetuating cycles of poverty.

Médecins Sans Frontières (MSF) has been on the front lines of this crisis, providing life-saving care to victims. In 2023 alone, MSF teams provided care to an astonishing 6,747 people who had suffered snakebites. This figure underscores the persistent and widespread nature of the problem and the critical role that humanitarian organisations play in addressing it, especially in areas where national health systems are overstretched or under-resourced.

Understanding Snakebite Envenoming

Snakebite envenoming occurs when a venomous snake injects its venom into a human through its fangs. The effects of the venom can vary widely depending on the species of snake, the amount of venom injected, and the victim's health and size. Snake venoms are complex biological cocktails containing a variety of toxins that can target different bodily systems. Some venoms are primarily neurotoxic, affecting the nervous system and causing paralysis, difficulty breathing, and even death. Others are hemotoxic, disrupting blood clotting, causing internal bleeding, and damaging blood vessels. Some venoms can also be cytotoxic, leading to local tissue damage, swelling, and necrosis (tissue death) at the bite site.

The initial symptoms of a snakebite can include:

• Pain and swelling at the bite site.
• Redness or bruising.
• Numbness or tingling.
• Nausea and vomiting.
• Dizziness or fainting.
• Difficulty breathing.
• Bleeding from the bite site or other parts of the body.

It is crucial to remember that not all snakebites from venomous snakes result in envenoming. Snakes may inject a 'dry bite' where no venom is injected, or only a small amount.

The Critical Role of Antivenom

The cornerstone of snakebite treatment is antivenom. Antivenom is a life-saving serum produced by immunising animals, typically horses or sheep, with small, non-lethal doses of snake venom. The animal's immune system produces antibodies against the venom, which are then extracted, purified, and processed into a therapeutic product. When administered to a person envenomed by a snake, these antibodies bind to the venom toxins, neutralising their harmful effects.

However, the production and distribution of antivenom face significant challenges:

• Cost: Effective antivenoms are often prohibitively expensive for many of the communities most affected by snakebites.
• Availability: Many rural clinics and hospitals in endemic areas lack a consistent supply of appropriate antivenom, leading to delays in treatment or the inability to treat certain types of envenoming.
• Specificity: Antivenoms are typically specific to certain types of snakes or geographical regions. A bite from a particular snake species may require a very specific antivenom, and using the wrong one can be ineffective or even harmful.
• Quality: The quality and efficacy of some antivenoms can be variable, particularly those produced without strict regulatory oversight.

MSF's advocacy for improved access to affordable and effective antivenom is therefore a direct response to these critical barriers. Ensuring that life-saving treatments are available where and when they are needed most is paramount to reducing mortality and morbidity from snakebite envenoming.

First Aid: What to Do and What NOT to Do

In the event of a suspected snakebite, prompt and appropriate first aid can significantly improve the outcome while awaiting professional medical help. It is vital to remain calm and to move the victim away from the snake to prevent further bites. Here's what you should do:

Do:

• Call for emergency medical help immediately. This is the most crucial step.
• Keep the victim as still as possible. Movement can increase the spread of venom.
• Immobilise the bitten limb. Use a splint or sling to keep the limb from moving.
• Position the bitten limb below the level of the heart, if possible, to slow venom circulation.
• Remove any tight clothing or jewellery from the bitten limb before swelling occurs.
• Wash the bite area gently with soap and water if available, but do not scrub.
• Try to remember the appearance of the snake (colour, pattern, size) to help medical professionals identify it, but do not attempt to catch or kill the snake.

Do NOT:

• Do NOT apply a tourniquet to the bitten limb, as this can restrict blood flow and cause tissue damage.
• Do NOT cut the wound or attempt to suck out the venom. This is ineffective and can increase the risk of infection.
• Do NOT apply ice or heat to the bite area.
• Do NOT give the victim alcohol or caffeine, as these can speed up venom absorption.
• Do NOT give the victim medication unless advised by a medical professional.
• Do NOT try to catch or kill the snake. This puts you at risk of another bite.

Medical Treatment: The Importance of Professional Care

Once at a medical facility, the treatment for snakebite envenoming will be determined by the type of snake, the severity of the envenoming, and the patient's symptoms. The primary treatment remains the administration of antivenom. Medical professionals will assess the patient for signs and symptoms of envenoming and decide on the appropriate type and dosage of antivenom.

Other supportive treatments may include:

• Pain management.
• Wound care and infection prevention.
• Monitoring of vital signs (blood pressure, heart rate, breathing).
• Treatment for specific symptoms, such as respiratory support if breathing is compromised.
• Management of complications like kidney failure or blood clotting disorders.

The effectiveness of antivenom is highest when administered as soon as possible after the bite. Delays in treatment can lead to more severe envenoming and a poorer prognosis.

Challenges and the Path Forward

Addressing the global snakebite crisis requires a multi-faceted approach. Beyond improving access to antivenom, efforts must focus on:

• Public education and awareness campaigns: To teach communities how to prevent snakebites, recognise venomous snakes, and administer appropriate first aid.
• Improved snakebite management training for healthcare workers: Equipping local health professionals with the knowledge and skills to diagnose and treat snakebites effectively.
• Research and development of new antivenoms: Creating broader-spectrum antivenoms and more heat-stable formulations that are easier to transport and store in remote areas.
• Strengthening health systems: Ensuring that healthcare facilities in snakebite-prone regions are adequately stocked with antivenom and have the necessary infrastructure for emergency care.
• Community engagement: Working with local communities to understand their needs and develop culturally appropriate prevention and treatment strategies.

The commitment of organisations like MSF, coupled with increased global attention and investment, offers hope for mitigating the devastating impact of snakebite envenoming and turning the tide on this silent epidemic.

Frequently Asked Questions

What is the most important thing to do after a snakebite?

Call for emergency medical help immediately and keep the victim as still as possible.

Is antivenom the only treatment for snakebite?

Antivenom is the primary and most crucial treatment for venomous snakebites. However, supportive care to manage symptoms and complications is also vital.

How can I prevent snakebites?

Avoid walking in tall grass or areas where snakes are known to live, especially at night. Wear protective footwear and clothing. Be cautious when handling firewood or rocks. Educate yourself and your family about local snake species and their behaviour.

What if I don't know what kind of snake bit me?

It is important to seek medical attention regardless of whether you know the snake species. Medical professionals can assess the symptoms and administer appropriate treatment, often using broad-spectrum antivenom if the snake cannot be identified.

Can traditional remedies cure snakebites?

Traditional remedies are generally not effective against snake venom and can sometimes be harmful or delay life-saving medical treatment. It is always best to seek professional medical care.

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