A 19-year-old man has facial and upper back lesions that have waxed and waned for the past 6 years. On physical examination, there are 0.3- to 0.9-cm comedones, erythematous papules, nodules, and pustules most numerous on the lower face and posterior upper trunk. Other family members have been affected by this condition at a similar age. The lesions worsen during a 5-day cruise to the Caribbean. Which of the following organisms is most likely to play a key role in the pathogenesis of these lesions?
□ (A) Staphylococcus aureus
□ (B) Herpes simplex virus type 1
□ (C) Group A β-hemolytic streptococcus
□ (D) Mycobacterium leprae
□ (E) Propionibacterium acnes
