Staphylococcus aureus Quiz: Ace Your Exams

Get ready to dominate your medical and nursing exams by using our dynamic quizzes to elevate your knowledge and increase your confidence. Whether you're gearing up for the USMLE®, COMLEX®, or your next in-class assessment, Osmosis quizzes tackle key topics in pathology, diagnostics, and treatment approaches. By honing in on clinical readiness and decision-making, we make sure the knowledge you gain empowers you both in the classroom and in real-world practice. Jump in and supercharge your exam prep!

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A 42-year-old man presents to the emergency department for evaluation of a painful red bump on the left  leg. The patient was initially bitten by a mosquito, but over the past several days, the area became red, hot, and tender to touch. He is otherwise healthy and does not smoke, use alcohol, or consume illicit substances. On physical examination, a 2 cm x 2 cm area of erythema, warmth, and fluctuance is observed on the anterior left leg as demonstrated below:

A close up photo shows a red, inflamed area on skin with a central raised bump, indicating a possible infection or ingrown hair.
Image reproduced from Wikimedia Commons

Which of the following pathogens is most likely responsible for this patient’s clinical presentation?  

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