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151890 Pathology

An 18-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 Adriatic. Which of the following organisms is most likely to play a key role in the pathogenesis of these lesions?

AGroup A b-hemolytic streptococcus
BHerpes simplex virus type 1
CMycobacterium leprae
DPropionibacterium acnes
Pathology
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