KATERYNA KON / SCIENCE PHOTO LIBRARY KATERYNA KON / SCIENCE PHOTO LIBRARY
Bacterial pneumonia. Computer illustration of rod-shaped bacteria (bacilli) inside the alveoli of the lungs, causing a lower respiratory tract infection. This is more generally known as pneumonia, though that term can also be reserved for specific types of infection. Severe lung infections are diagnosed by X-ray and treated by antibiotics. The alveoli are the site of gaseous exchange between the air in the lungs and the blood.
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