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Pneumonia Source: National Heart and Lung and Blood Institute, National Institutes of Health. www.nhlbi.nih.gov Pneumonia is an infection in one or both of the lungs. Many small germs, such as bacteria, viruses, and fungi, can cause pneumonia.
The infection causes your lungs’ air sacs, called alveoli, to become inflamed. The air sacs may fill up with fluid or pus, causing symptoms such as a cough, fever, chills, and trouble breathing. Pneumonia and its symptoms can vary from mild to severe. Many factors affect how serious pneumonia is, such as the type of germ causing the infection and your age and overall health.
Pneumonia tends to be more serious for:
Infants and young children.
Older adults (people 65 years or older).
People who have other health problems like heart failure, diabetes, or COPD (chronic obstructive pulmonary disease).
People who have weak immune systems as a result of diseases or other factors. These may include HIV/AIDS, chemotherapy (a treatment for cancer), or an organ or bone marrow transplant. Deoxygenated blood
from the heart Bronchioles Oxygenated blood to the heart Alveoli - site of gas exchange LifeART Collection Images Copyright © 1989-2001 by Lippincott Williams & Wilkins, Baltimore, MD