Laboratory Testing for Cat Bites

Indications for Laboratory Testing

Clean, superficial wounds without signs of infection can be managed with wound care and prophylactic antibiotics alone, as recommended by the medical community 1, 2
Aerobic and anaerobic cultures from the wound should be obtained if there is purulent drainage, the patient has failed initial antibiotic therapy, as suggested by medical guidelines 2
Gram stain can provide rapid preliminary information about bacterial pathogens, according to the Clinical Infectious Diseases journal 3

Plain radiographs are indicated when bites are near bones or joints to evaluate for periosteal penetration, fracture, or foreign body, as recommended by medical guidelines 1
MRI or CT may be needed for suspected deep abscess, septic arthritis, or osteomyelitis, according to medical guidelines 1

Immunocompromised patients should have a lower threshold for obtaining blood cultures and inflammatory markers, and consider testing for atypical presentations of Bartonella, as suggested by the Clinical Infectious Diseases journal 1, 4
Diabetic patients should have a vascular assessment to evaluate arterial supply to the affected limb, and consider inflammatory markers to monitor response to therapy, according to medical guidelines 1

Amoxicillin-clavulanate 875/125 mg twice daily is the first-line empiric therapy, regardless of laboratory results, providing excellent coverage against Pasteurella multocida and polymicrobial flora, as recommended by medical guidelines 1, 2, 5
For penicillin-allergic patients, doxycycline 100 mg twice daily is the preferred alternative, according to medical guidelines 1, 2