Causes of pneumonia
INTRODUCTION

An illness called pneumonia causes the air sacs in one or even both lungs to become inflamed. The air sacs may swell with fluid or pus (purulent material), which can lead to a cough that produces pus or phlegm, a fever, chills, and breathing difficulties. Pneumonia can be brought on by a number of different species, including bacteria, viruses, and fungi.

The severity of pneumonia can range from minor to life-threatening. The most vulnerable groups include newborns and young children, adults over 65, and those with health conditions or weaker immune systems.

Symptoms

Pneumonia can present with mild to severe signs and symptoms, depending on the type of germ that caused the illness, your age, and general health. Mild common symptoms frequently resemble cold or flu symptoms, but they linger longer.
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