Pneumonia is a lung infection, usually caused by bacteria or viruses, often after a cold or flu. It causes air sacs in the lung to fill with fluid and mucus, affecting breathing. Pneumonia can be more serious in children, the elderly and people with weakened immune systems.…
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About this article
Author: Dr Joanne Van der Velden PhD, BSc (Hons)
First answered: 18 Sep 2014
Last reviewed: 19 May 2018
Rating: 4.8 out of 5
Votes: 1196 (Click smiley face below to rate)
Category: Pneumonia