What antibiotic should be given to an adult without known drug allergies who has a wound contaminated by a chicken?

Antibiotic for Chicken-Contaminated Wounds

For an adult with a wound contaminated by chicken, treat with amoxicillin-clavulanate 875/125 mg twice daily orally, as this covers the expected pathogens including Staphylococcus aureus, Streptococcus species, and potential gram-negative organisms from poultry contamination.

Rationale and Evidence

The IDSA guidelines 1 specifically address animal bite wounds and contaminated injuries, recommending amoxicillin-clavulanate as first-line oral therapy for animal-related wounds. While the guideline table focuses on traditional animal bites (dogs, cats), the same principles apply to chicken-contaminated wounds given the overlapping bacterial flora.

Expected Pathogens

Chicken-contaminated wounds present a mixed bacterial threat:

• Staphylococcus aureus is the predominant organism in poultry, with studies showing 89.5% of retail chicken contaminated with S. aureus 2, and 62.5% of poultry farm isolates being S. aureus 3
• Streptococcus species and other skin commensals
• Gram-negative organisms from the poultry environment
• Potential for multidrug-resistant strains, as 95.3% of poultry-associated Staphylococcus showed resistance to three or more antibiotics 3

Why Amoxicillin-Clavulanate

This combination provides:

• Broad-spectrum coverage against both gram-positive (S. aureus, Streptococcus) and gram-negative organisms
• Beta-lactamase inhibition via clavulanate, which overcomes common resistance mechanisms
• Proven efficacy in animal-related wound contamination 1

Important Caveats

Watch for treatment failure: The research evidence reveals concerning resistance patterns in poultry-associated Staphylococcus:

• 96.9% resistance to penicillin G 3
• 65.6% resistance to amoxicillin alone 3
• However, only 5% resistance to ciprofloxacin 3

If the patient fails initial therapy or develops systemic signs (fever, spreading erythema, lymphangitis), consider:

• Ciprofloxacin 500-750 mg twice daily orally, which showed 95.3% susceptibility against poultry Staphylococcus 3
• Adding MRSA coverage if risk factors present (see below)
• Obtaining wound cultures before switching antibiotics

When to Add MRSA Coverage

Add vancomycin or other anti-MRSA agents if the patient has 1:

• Failed initial antibiotic treatment
• Markedly impaired host defenses (diabetes, immunosuppression)
• Systemic inflammatory response (fever >38°C, tachycardia >90, WBC >12,000)
• Known MRSA colonization or prior MRSA infection

Dosing and Duration

• Amoxicillin-clavulanate 875/125 mg orally twice daily 1
• Duration: 7-10 days for uncomplicated wounds 1
• Ensure adequate wound care with debridement of devitalized tissue 4

Alternative for Penicillin Allergy

If true penicillin allergy (not just intolerance):

• Doxycycline 100 mg twice daily provides good activity against poultry-associated organisms 1
• Avoid clindamycin monotherapy despite guideline listing, as it misses gram-negative organisms and has poor activity against Pasteurella species that may be present 1