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A healthy 35-year old female presents with three weeks of fever, cough, and dyspnea.She is a native of Haiti, living in Boston for two years. On physical exam she was tachypneic, tachycardic, febrile, but in no acute distress. Her room air oxygen saturation was 85%, improved to 96% on 4-Liters oxygen via nasal cannula. Chest x-ray
depicted faint diffuse homogenous reticulonodular markings. Diagnosis?....