A patient with an odontogenic infection (and no penicillin allergy) should be treated with which first-line antibiotic?

Correct answer: A. Penicillin VK

• A. Correct. Penicillin VK (or amoxicillin) is first-line for most odontogenic infections in a non-allergic patient (amoxicillin–clavulanate or clindamycin for spreading/resistant cases).
• B. Vancomycin is reserved for serious resistant gram-positive infections (e.g., MRSA), not routine odontogenic infections.
• C. Ciprofloxacin targets gram-negatives and is not first-line for odontogenic infections.
• D. Tetracycline is not first-line and is contraindicated in children/pregnancy.

Note: Source stem was garbled; reconstructed to test the first-line antibiotic for odontogenic infection.