HIV-Positive Woman With Dyspnea

A 48-year-old African American woman with HIV infection who had been hospitalized several days earlier for presumed Pneumocystis carinii pneumonia (PCP) is readmitted because of worsening dyspnea and a temperature of 38.8oC (102oF). She also complains of painful swelling and erythema on her right arm. Her symptoms have worsened despite treatment with trimethoprimsulfamethoxazole.