A 63-year-old man who has been previously healthy is admitted to the hospital with a 2-day history of cough, rigors, fever, and right-sided pleuritic chest pain. Chest x-ray shows consolidation of the right lower lobe (RLL) and a free-flowing right pleural effusion. Thoracentesis is performed, and the pleural fluid has the following characteristics:Cell count=1110/mm3Glucose=75 mg/dL (serum glucose=85 mg/dL)Protein=4.0 g/dL (serum protein=7.0 g/dL)LDH=400 U/Lserum LDH=200 U/L, normal=100-200 U/LpH=7.35What is the pathogenesis of the pleural effusion?