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False-colour chest X-ray showing lobar pneumonia in the lower lobe of a patient's right lung, which appears as the pale blue area of the lower lung at left of image. The disease is caused by certain strains of the bacterium Streptococcus pneumoniae. Alveoli (the air sacs of the lung) become blocked with pus, forcing air out and causing the lung to become solidified. Here, colouring highlights the reduction in effective size of healthy lung on the left of image, compared to the normal right-side lung.
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