An 18-year-old girl was admitted to the hospital because of chest pain, fever, and chills for acouple of days. On the day of admission, cough with blood-tinged sputum were also noted.She worked as a waitress in a night-club. She appeared acutely ill; body temperature was39.4℃, respiratory rate 30/min, pulse rate 110/min, and blood pressure 112/70 mmHg. Chestauscultation revealed coarse rhonchi over lung fields bilaterally. A grade 2/6 systolicmurmur was audible along the left sternal border. Liver & spleen were not palpable.Examination of the extremities showed tracks of needle injection marks along the antecubitalveins on forearms. There was no leg edema. A chest-x-ray showed bilateral multiplepatch infiltrations over lung fields. Blood cell counts showed white blood cell 22,000/mm3,red blood cell 3,000,000/mm3, hemoglobin 9 g/dL, hematocrit 31%, platelets 189,000/mm3;differential counts showed segment 80%, lymphocyte 16%, monocyte 2%, eosinophil 1%,and basophil 1%. Urinalysis showed 4+ protein, as well as red blood cell and white bloodcell casts. Blood urea nitrogen (BUN) was 40 mg/dL, creatinine 2 mg/dL, sugar 112 mg/dL,sodium 143 mEq/L, and potassium 3.3 mEq/L. What is your diagnosis? What is your plan?(20%)