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A 56-yeаr-оld blаck femаle presents with shоrtness оf breath which has been progressive over the last week. Patient does report having had a URI approximately one week ago. On physical exam she is found to have decreased breath sounds on the left, suggesting a left pleural effusion, which is subsequently confirmed on chest x-ray. Patient's physical exam is otherwise remarkable for patient appearing ill, with shortness of breath. Vitals signs show pt to be afebrile, with HR of 112, BP 102/70 RR22. Patient has a past medical history of rheumatoid arthritis, as well as recurrent pneumonia. Allergies are none. Current medications include Methotrexate 15 mg po weekly and prednisone 5 mg daily. Patient's labs are significant for a white count of 14,000, with 75% neutrophils. Chemistries are significant for having a creatinine of 1.15. LDH is 330, total protein is 7.2. Fluid analysis shows a cloudy turbulent fluid. Thoracentesis fluid reveals :WBCs 20000/ml- neutrophils 85%, Lymphocytes 10%. Glucose is 20. LDH 250. Total protein 5.6. PH is 7.1 Gram stain reveals large numbers of neutrophils with occasional gram positive cocci. What is the most likely cause of patient's pleural effusion?