The patient was a 34-year-old, HIV-seropositive woman who presented with a fever, productive cough, diarrhea, headache, dizziness, anorexia, nausea, sore throat, and dysphagia. She also noted a 10-lb weight loss over the previous 2 months. She had not received any treatment for her HIV infections or prophylaxis for opportunistic infections.
What is this individual suffering from and what is the likeliest causative agent?