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With pneumonia, the air sacs may fill with fluid or pus. The infection can be life-threatening to anyone, but particularly to infants, children and people over 65.

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Many germs can cause pneumonia. The most common are bacteria and viruses in the air we breathe. our body usually prevents these germs from infecting your lungs. But sometimes these germs can overpower your immune system, even if your health is generally good.

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Antibiotics can treat many forms of pneumonia. Mild pneumonia can usually be treated at home with rest, antibiotics (if it's likely be caused by a bacterial infection) and by drinking plenty of fluids. More severe cases may need hospital treatmentFirst-line antibiotics that might be selected include the macrolide antibiotics azithromycin (Zithromax) or clarithromycin (Biaxin XL); or the tetracycline known as doxycycline.

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Get Vaccinated

Get a flu shot every year to prevent seasonal influenza. The flu is a common cause of pneumonia, so preventing the flu is a good way to prevent pneumonia. Children younger than 5 and adults 65 and older should get vaccinated against pneumococcal pneumonia, a common form of bacterial pneumonia.

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The signs and symptoms of pneumonia vary from mild to severe, depending on factors such as the type of germ causing the infection, and your age and overall health. Mild signs and symptoms often are similar to those of a cold or flu, but they last longer.

Signs and symptoms of pneumonia may include:

Chest pain when you breathe or cough

Confusion or changes in mental awareness (in adults age 65 and older)

Cough, which may produce phlegm

Fatigue

Fever, sweating and shaking chills

Lower than normal body temperature (in adults older than age 65 and people with weak immune systems)

Nausea, vomiting or diarrhea

Shortness of breath