Animal bite
Animal bite | |
---|---|
Military working dog training to attack by biting | |
Specialty | Emergency medicine |
An animal bite is a
Signs and symptoms
Bite wounds can cause a number of signs and symptoms
- Generalized tissue damage due to tearing and scratching
- Serious hemorrhageif major blood vessels are pierced
- bacteria or other pathogens, including rabies
- Introduction of venom into the wound by venomous animals such as some snakes
- Introduction of other irritants into the wound, causing itching
Classification
Bites are usually classified by the type of animal causing the wound. Many different animals are known to bite humans.
Vertebrates
- Companion animals, including dogs, cats, rats, ferrets, and parrots, may bite humans.
- Human bitesare themselves capable of doing great flesh damage, but are particularly known for spreading communicable diseases
Involuntary
Teething infants are known to bite objects to relieve pressure on their growing teeth, and may inadvertently bite people's hands or arms while doing so. Young children may also bite people out of anger or misbehaviour, although this is usually corrected early in the child's life.
Reverse bite injury
A reverse bite injury (also called a clenched fist injury, closed fist injury, or fight bite) results when a person punches another person in the face, and the skin (and sometimes tendons) of their knuckles are cut against the teeth of the person they are punching.[2] The proximity of the wound is often located over the metacarpophalangeal joint resulting in tendon injury.[3]
The medical treatment of this injury is similar to those of a
These injuries should be managed as other human bites: wound irrigation and
Arthropods
The bites of arthropods have some of the most serious health consequences known. Mosquito bites transmit serious disease and result in millions of deaths and illnesses in the world. Ticks also transmit many diseases such as Lyme disease.
- Spider bite
- Insect bites and stings
- Flea bites are responsible for the transmission of plague.
- Mosquito bites are responsible for the transmission of dengue fever and malaria.
- Leech bite
Mechanism
Trauma
A natural consequence of a bite is tissue trauma at the site. Trauma may consist of scratching, tearing, punture or laceration of the skin, hematoma (bruising), embedding of foreign objects, for example a tooth or hair, damage to or severing of underlying structures such as connective tissue or muscle, amputations, and the ripping off of skin and hair. If major blood vessels are damaged, severe blood loss can occur.[6]
Infection
Pathogen organisms can be introduced into the bite. Some of the pathogens can originate from the mouth of the 'biter', the substrate onto which the injured person or animal can fall or from the naturally occurring microorganisms that are present on the skin or hair of the animal. The advent of antibiotics improved the outcome of bite wound infections.[6]
Rabies
Animal bites where skin has been penetrated, most commonly by dogs and bats, transmit rabies to humans.[7] Rabies from other animals is rare.[7] If the animal is caught alive or dead with its head preserved, the head can be analyzed to detect the disease. Signs of rabies include foaming at the mouth, growling, self-mutilation, jerky behavior, red eyes, and hydrophobia.
If the animal cannot be captured, preventative rabies treatment is recommended in many places. Several countries are known not to have native rabies, see the Wikipedia page for prevalence of rabies.
Treatment
The first step in treatment includes washing the bite wound.
Antibiotics
Antibiotics to prevent infection are recommended for dog and cat bites of the hand,[10] and human bites if they are more than superficial.[11] They are also recommended in those who have poor immune function.[8] Evidence for antibiotics to prevent infection in bites in other areas is not clear.[12]
The first choice is
Vaccinations
Rabies prevention is generally available in
Prior toxoid | Clean minor wounds | All other wounds |
< 3 doses | TT: yes, TIG: no | TT: yes, TIG: yes |
≥ 3 doses | TT: if last dose ≥ 10yr TIG: no |
TT: if last dose ≥ 5yr, TIG: no |
TT = tetanus toxoid; TIG: tetanus immune globulin
Mosquito bites
Epidemiology
Human bites are the third most frequent type of bite after dog and cat bites.
Up to three-fourths of dog bites happen to those younger than 20 years-old. In the United States, the costs associated with dog bites are estimated to be more than $1 billion annually. The age groups that suffer most from dog bites are children 5 to 9 years-old. Often, bites go unreported and no medical treatment given - these bites go unreported. As many as one percent of pediatric emergency room visits are for treatment for animal bites. This is more frequent during the summer months. Up to five percent of children receiving emergency care for dog bites are then admitted to the hospital. Bites typically occur in the late afternoon and early evening. Girls are bitten more frequently by cats than they are by dogs. Boys are bitten by dogs two times more often than girls are bitten by dogs.[6]
History
The bites of humans are recorded during the biblical era. Reports of secondary infection occurring after a human bite in children have been noted in the United States since at least 1910. Morbidity and mortality rates improved with the use of antibiotics.[6]
See also
- Bite force quotient
- Wilderness first aid
- Dog bite
- Dog bite prevention
References
- ISSN 2214-109X.
- ^ PMID 11880877.
- PMID 17582031.
- PMID 25770897.
- PMID 14614671.
- ^ ISBN 978-1-4557-1177-2.[page needed]
- ^ a b "Rabies Fact Sheet N°99". World Health Organization. September 2014. Retrieved 10 January 2015.
- ^ a b c d "Animal bites Fact sheet N°373". World Health Organization. February 2013. Retrieved 5 May 2014.
- PMID 31805611.
- ^ "Antibiotics in cat bites". BestBets.
- ^ PMID 19555903.
- PMID 11406003.
- ^ "BestBets: Oral antihistamines for insect bites".
- PMID 24436765.
- ^ Questions and Answers about Dog Bites Archived 4 March 2009 at the Wayback Machine