A 43-year-old man presents with complaint of a 3-day history of localized pain, redness, and swelling of his upper eyelid. He denies fever, visual changes, or photophobia. On physical examination, the patient's eyelid is diffusely red, with a tender, localized area of swelling, which points outward. He appears to have an infection of the glands of the upper eyelid. The most common pathogen associated with this infection is which of the following?
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