ANDRE LABBE, ISM / SCIENCE PHOTO LIBRARY ANDRE LABBE, ISM / SCIENCE PHOTO LIBRARY
Viral pneumonia. Frontal X-ray of the lungs of a 12-year-old girl, showing diffuse viral pneumonia of the right and left lower lobes of the lungs. The viral infection causes inflammation of the lungs. 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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