A 55-year-old man with established RA (RF+, anti-CCP+, 5 years' duration) on stable etanercept 50 mg SC weekly + methotrexate 15 mg/week presents with acute onset of dyspnea, dry cough, and low-grade fever over 3 days. Chest X-ray shows bilateral interstitial infiltrates. TB screening (sputum smear, GeneXpert) is negative. High-resolution CT chest confirms interstitial pneumonia. What is the most appropriate immediate management?

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