Kinkajou Bite

Etiology

Animal bites account for significant morbidity and mortality worldwide. Most patients presenting to the ED with animal bites usually have been bitten by dogs and cats. Kinkajou bites, although rare, must undergo an evaluation with similar urgency. Medical literature on kinkajou bites is scarce, and the only reported bacterial isolates from kinkajou bites are that of alpha-hemolytic streptococci, mixed anaerobic bacteria, and Kingella potus which forms the bulk of the strains.[3][4]

Reported isolates were from a female zookeeper who had to undergo exploratory surgery of her hand due to suspected infection of her flexor tendons after a kinkajou bite. She was treated successfully with clarithromycin, ciprofloxacin, and metronidazole for 14 days.[1]

The only other case of a kinkajou bite in literature reports zoonotic transmission of Blastomyces dermatitidis to a man from his pet kinkajou after a bite. This reported patient had a recalcitrant infection after being on antibiotics. Physical exam findings suggested chronic ascending lymphadenitis, and he fully recovered after being treated with itraconazole for six months.[5]

Epidemiology

Most animal bites presenting to the emergency department are due to dogs and cats; kinkajou bites are rare. There are no reported incidence rates of kinkajou bites in the United States. Based on case reports in the literature, caretakers of these kinkajous have the most bite wounds.[6]

Pathophysiology

Kinkajou bite wounds both in literature and including the author's one reported case had been small puncture wounds with minimal tissue tear. There is no reported blunt force trauma to the bones. Following the bite injury, there are reports of soft tissue infections treated successfully with antibiotics. The wound discussed in this case was narrow and deep, with the mechanism of the bite described by the patient as biting and holding down.[7]

History and Physical

Clinicians should take a detailed history and physical exam of every patient with a kinkajou bite. These should include information about the circumstances surrounding the bite incident, for example, the bite location and how long it took the patient to seek medical care after the bite. The patient might need local anesthesia during the exploration of the bite site.[7]

Evaluation

A patient's bite site should have a thorough evaluation to assess for underlying neurovascular compromise or foreign body presence. The patient must be provided with appropriate pain management for associated swelling at the bite site. An active and passive range of motion testing should be performed to assess for underlying tendon involvement. The patient further is evaluated for the need for any imaging at the bite site such as X-ray, ultrasound, MRI, or CT. If need be, a patient should be taken to the operating room for irrigation and exploration under local anesthesia.

Treatment / Management

Given the lack of literature and guidelines on how to manage kinkajou bites and subsequent development of cellulitis, the following is a proposed protocol based on the reported case and current animal bite treatment and management guidelines.

• Wound management as per current wound-care guidelines for animal bites including irrigation, exploration, and debridement of the wounds
• Proper imaging (X-ray, ultrasound, CT, or MRI) are necessary imaging modalities for the assessment of deeper structure involvement.
• Assess for any need for surgical exploration at the wound site.
• Based on the type of wound, if the risk of infection is high at the kinkajou bite site patient should be admitted to the hospital.
• Obtain wound and blood cultures before the start of any antibiotics.
• The patient should be started on broad-spectrum antibiotics to cover both gram-positive and gram-negative infections.
• Administer tetanus toxoid, DTaP, or Td as indicated.
• Kinkajou bite patients should get rabies vaccine series, which consists of a regimen of one dose of immune globulin at patient presentation and four doses of the rabies vaccine over 14 days.

Differential Diagnosis

The following should merit consideration in the differential diagnosis:

• Cellulitis
• Abscess
• Sepsis

Prognosis

With prompt evaluation by a qualified health care provider and interprofessional team, prognosis is good.

Complications

If the bite wound is not cleaned and adequately and inspected, complications such as cellulitis or abscess formation may occur.