MRCP2-4428
A 40-year-old woman arrives at the Emergency Department complaining of a dry cough, fever, and fatigue that have persisted for three weeks. She has no medical history and does not take any regular medications. She has not traveled abroad recently. During the clinical examination, inspiratory crepitations are detected in the left upper and right lower zones. Her oxygen saturation is 91% on room air. A chest x-ray reveals bilateral peripheral pulmonary infiltrates.
The following blood test results are obtained:
– Hemoglobin (Hb): 110 g/L
– Mean corpuscular volume (MCV): 78 fL
– White blood cell count (WCC): 13 x 10^9/L
– Neutrophils: 8 x 10^9/L
– Lymphocytes: 1 x 10^9/L
– Eosinophils: 3.1 x 10^9/L
– Platelets: 560 x 10^9/L
– C-reactive protein (CRP): 115mg/l
What is the most appropriate treatment for the likely diagnosis?