Which of the following Beta lactam can be used in an individual who is allergic to penicillin?: (A) Imipenem, (B) Carbenicillin, (C) Aztreonam, (D) Ticarcillin
Answer is C. Aztreonam is a monobactam (contains single B-lactamase ring) and is the onlly beta lactam antibiotic that can be used in patients of penicillin hypersensitivity as cross allergy is not seen with it.