Question

The image shows a skin condition with a raised, well-defined, bright red rash on the upper limb. What is the most suitable antibiotic for this condition?

• A. Amoxycillin & Clavulinic acid
• B. Amikacin
• C. Norfloxacin
• D. Metronidazole

Hint:

Think about the causative organism of the bright red, sharply demarcated skin infection shown.

Answer 1

The Correct Option is A

Approach: The image depicts erysipelas -- a superficial dermis and lymphatic infection. Key features: bright red, sharply demarcated, raised plaque on the skin.

Causative agent: Streptococcus pyogenes (Group A beta-hemolytic Streptococcus) is the primary pathogen in >90% of cases.

Drug of choice: Penicillin and its derivatives are first-line. Among the options, Amoxycillin + Clavulanic acid (a beta-lactam/beta-lactamase inhibitor combination) is the best choice -- it covers streptococci and also provides broader coverage in case of mixed infection.

Why not the others?
- Amikacin (aminoglycoside): gram-negative coverage, poor activity against streptococci
- Norfloxacin (fluoroquinolone): gastrointestinal/urinary use, poor streptococcal activity
- Metronidazole: anaerobic/protozoal coverage, inactive against streptococci

\[\boxed{\text{Amoxycillin and Clavulanic acid}}\]