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Bite Injury: Causes, Symptoms and Treatment

A bite injury is a wound caused by the bite of an animal or human that can lead to infections and serious complications. Prompt medical care is essential.

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A bite injury is a wound caused by the bite of an animal or human that can lead to infections and serious complications. Prompt medical care is essential.

What Is a Bite Injury?

A bite injury (also called a bite wound) is damage to the skin and underlying tissue caused by the bite of an animal or another person. Bite injuries are common in everyday life and range from minor scratches to deep wounds affecting muscles, tendons, or bones. The most frequent causes are bites from dogs, cats, and humans.

Causes and Common Sources

Bite injuries can be caused by a wide variety of animals or by other people. The most common sources include:

Dogs: The most common cause of bite injuries worldwide. Dog bites can leave deep lacerations.
Cats: Cat bites are typically smaller but often deep and puncture-like, which significantly increases the risk of infection.
Humans: Human bites carry a particularly high infection risk due to the large number of bacteria found in the human mouth.
Wild animals: Bites from foxes, bats, rats, or other wild animals can transmit dangerous diseases such as rabies.
Insects and spiders: Insect stings and spider bites can cause allergic reactions or toxic effects.

Symptoms

The symptoms of a bite injury depend on the depth and location of the wound as well as the animal involved. Common signs include:

Pain, swelling, and redness around the wound
Bleeding from the bite wound
Lacerations or puncture channels in the skin
Numbness or tingling (if nerves are involved)
Signs of infection: increasing redness, warmth, pus formation, fever
Swollen lymph nodes near the wound

Possible Complications

If not properly treated, bite injuries can lead to serious complications:

Bacterial infections: Particularly common from pathogens such as Pasteurella multocida (from animal bites) or Capnocytophaga canimorsus (from dog bites).
Rabies: A life-threatening viral disease that can be transmitted through infected animals.
Tetanus: A bacterial disease that can occur if vaccination protection is insufficient.
Sepsis: A life-threatening systemic infection that can develop from an untreated bite wound.
Scarring and tissue damage: Deep bites can cause permanent damage to muscles, tendons, or nerves.

Diagnosis

Diagnosis of a bite injury is usually made through physical examination of the affected area. The healthcare provider assesses the depth, extent, and nature of the wound. If deeper injuries or infections are suspected, additional investigations may be needed:

X-rays to assess bone involvement or foreign bodies
Wound swabs to identify bacteria
Blood tests if systemic infection is suspected

Treatment

Immediate First Aid

After a bite injury, the wound should be immediately and thoroughly washed with soap and water. Disinfection with an appropriate antiseptic is important. If there is heavy bleeding, pressure should be applied to the wound.

Medical Care

All bite injuries deeper than superficial scratches should receive medical attention. The following measures may be required:

Thorough wound cleaning and irrigation by healthcare professionals
Wound closure (sutures, staples, or wound strips) depending on the type and location of the wound
Antibiotic treatment to prevent or treat infections (e.g., amoxicillin/clavulanate)
Tetanus vaccination or booster if protection is insufficient
Rabies prophylaxis for bites from wild or unknown animals

When to Seek Immediate Medical Help

The following situations require immediate medical attention:

Deep wounds, heavy bleeding, or injuries to the face, hands, or joints
Bites from wild or unknown animals (risk of rabies)
Signs of infection (fever, increasing swelling, pus)
Bites in people with weakened immune systems, diabetes, or other underlying conditions

Prevention

Bite injuries can be reduced by taking a few simple precautions:

Exercise caution around unfamiliar or wild animals
Educate children on how to interact safely with animals
Ensure pets are regularly vaccinated against rabies and other diseases
Maintain up-to-date vaccinations against tetanus and, for high-risk groups, rabies

References

World Health Organization (WHO): Animal bites - Fact sheet. Geneva, 2023. Available at: www.who.int
Centers for Disease Control and Prevention (CDC): Animal Bites - Prevention and Treatment. Atlanta, 2023. Available at: www.cdc.gov
Stevens DL et al.: Practice Guidelines for the Diagnosis and Management of Skin and Soft Tissue Infections. Clinical Infectious Diseases, 2014;59(2):e10-e52.

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