Staphylococcus aureus

A 42-year-old woman with a history of penicillin anaphylaxis presents with a methicillin-resistant Staphylococcus aureus (MRSA) skin abscess requiring systemic antibiotic therapy. Which is the drug of choice?

A 32-year-old woman from Delhi presents with a 5-day history of painful pustules on her forearm following a minor cut. Culture yields Staphylococcus aureus. Which single finding would most reliably distinguish a community-associated MRSA (CA-MRSA) strain from a healthcare-associated MRSA (HA-MRSA) strain in this patient?

All of the following are virulence factors of Staphylococcus aureus EXCEPT:

A 32-year-old woman presents with a 3-day history of fever, myalgia, and hypotension. She has a diffuse erythematous rash on her trunk and extremities. She had a surgical wound infection 5 days ago from which Staphylococcus aureus was isolated. Which of the following is NOT a recognized mechanism by which this organism causes toxic shock syndrome?

A 35-year-old male presents with a 3-day history of fever, productive cough, and pleuritic chest pain. Chest X-ray shows a left-sided pneumonia with a small pleural effusion. Blood cultures are pending. Sputum Gram stain shows numerous gram-positive cocci in clusters. Which investigation is most appropriate to confirm the diagnosis of Staphylococcus aureus pneumonia and guide antibiotic therapy?