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A lung abscess is a bacterial infection that occurs in the lung tissue. The infection causes tissue to die, and pus collects in that space.
Thoracentesis is a procedure done when there's too much fluid in the pleural space. The goal is to drain the fluid and make it easier for you to breathe again.
Bacterial pneumonia is an infection in one or both lungs. It may involve just one small section of your lung, or it may encompass your entire lung.