SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY SCOTT CAMAZINE / SCIENCE PHOTO LIBRARY
Pneumonia. Coloured X-ray of the chest of a 2- year-old girl with pneumonia (green) in the middle lobe of the right lung. The heart is pink and the liver is purple. Pneumonia may be bacterial or viral in origin. The pathogen is inhaled into a lung segment or lobe, where it causes the alveoli (air sacs) to become blocked with pus. Symptoms include fever, chest pain, coughing and blood in the sputum. Bacterial pneumonia is usually treated with antibiotics, although some bacteria are now resistant to many antibiotics. Viral pneumonia can be treated with antiviral drugs and the use of humidified air and oxygen.
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