Amoxicillin + clavulanic acid is active against the following organisms EXCEPT :

Staphylococcus aureus develops resistance to methicillin by acquiring altered penicillin-binding proteins that have low affinity. No Beta-lactam antibiotic is effective against MRSA. Clavulanic acid is an inhibitor of β-lactamase. It can restore the sensitivity of penicillins against the organisms who have developed penicillinases.