A 52-year-old cisgender man with HIV and a CD4 count of 66 cells/mm3 presents to the clinic for evaluation of several painless, purplish nodules on his right arm (Figure 1). He cares for multiple cats, often taking in strays. He is not taking any medications. Biopsy of a skin lesion is performed and demonstrates vascular proliferation as well as numerous bacilli on Warthin-Starry silver stain.
Which one of the following is the most likely causative organism of this patient’s condition?
Figure 1. Nodular Skin Lesion
Source: Photograph from David H. Spach, MD
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Question Last Updated
September 30th, 2023
September 30th, 2023
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