Cat bite

Cat bites are at higher risk of infection as a result of their long, sharp, and thin teeth. Their bites create multiple punctures that inoculate the affected tissue with bacteria. Along with dogs, cats contain Pasteurella multocida within their mouths.

Pasteurella infections occur rapidly after cat bites, usually within 24 hours. As seen in the photo above the infection is characterized by cellulitis, often with lymphangitis. If the infection is limited to local cellulits, then oral antibiotics are indicated with close follow up. Augmentin is the antibiotic of choice for Pasteurella. If the infection shows signs of rapid spread and lymphangitis, then IV antibiotics and admission are indicated. Unasyn is the antibiotic of choice.

The patient in this photograph sustained a bite from his own cat approximately 24 hours prior to presentation. He was immediately started on Unasyn and admitted. He did well and was discharged home without further complication.

References:

Tintinalli JE, Kelen GD, Stapczynski JS. Emergency Medicine: A Comprehensive Study Guide, 6th ed. New York: McGraw-Hill; 2004.