MICHEL BRAUNER, ISM / SCIENCE PHOTO LIBRARY MICHEL BRAUNER, ISM / SCIENCE PHOTO LIBRARY
Lobar pneumonia. Frontal X-ray of the lungs of a 47-year-old man, showing acute lobar pneumonia of the lower lobe of the left lung (lower right). Lobar pneumonia is a bacterial infection that causes inflammation of the lungs. The infection here is with Streptococcus pneumoniae bacteria. The alveoli (the air sacs of the lungs) become blocked with pus and solidify. The solid areas are visible on X-rays. Symptoms are coughing and chest pain.
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