What antibiotic is recommended for an open cat bite wound?

What antibiotic is recommended for an open cat bite wound?

• A. Penicillin alone
• B. Doxycycline
• C. Ciprofloxacin
• D. Amoxicillin-clavulanate

Answer: (D)

Open cat bite wounds are contaminated with the cat’s oral flora, which includes Pasteurella multocida as well as anaerobic bacteria. Treating these wounds effectively requires broad coverage that targets both aerobes and anaerobes. Amoxicillin-clavulanate is ideal because amoxicillin provides activity against many oral pathogens, and the clavulanate inhibits beta-lactamases produced by anaerobes and other resistant organisms, expanding coverage to anaerobes such as Bacteroides and Fusobacterium. This combination gives comprehensive empiric coverage for bite wounds. Penicillin alone lacks reliable anaerobic and beta-lactamase–produced organism coverage, so it’s not sufficient here. Doxycycline covers Pasteurella but has inadequate anaerobic coverage, making it a less ideal first-line option for cat bites. Ciprofloxacin provides limited anaerobic coverage and is not the preferred choice for bite wounds. Thus, amoxicillin-clavulanate best addresses the typical open-cat-bite infection risk.

Open cat bite wounds are contaminated with the cat’s oral flora, which includes Pasteurella multocida as well as anaerobic bacteria. Treating these wounds effectively requires broad coverage that targets both aerobes and anaerobes.

Amoxicillin-clavulanate is ideal because amoxicillin provides activity against many oral pathogens, and the clavulanate inhibits beta-lactamases produced by anaerobes and other resistant organisms, expanding coverage to anaerobes such as Bacteroides and Fusobacterium. This combination gives comprehensive empiric coverage for bite wounds.

Penicillin alone lacks reliable anaerobic and beta-lactamase–produced organism coverage, so it’s not sufficient here. Doxycycline covers Pasteurella but has inadequate anaerobic coverage, making it a less ideal first-line option for cat bites. Ciprofloxacin provides limited anaerobic coverage and is not the preferred choice for bite wounds.

Thus, amoxicillin-clavulanate best addresses the typical open-cat-bite infection risk.