Pneumonia
Pneumonia is an infection of the lungs that is usually caused by bacteria or viruses. It can cause mild to severe illness in people of all ages. Certain people are more likely to become ill with pneumonia. This includes adults 65 years of age or older and children less than 5 years of age.
Globally, pneumonia causes more deaths than any other infectious disease. It is the leading cause of death in children worldwide.1 However, it can often be prevented with vaccines and can usually be treated with antibiotics or antiviral drugs.
1 http://www.who.int/mediacentre/factsheets/fs331/en/index.html
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