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Pneumonia is an infection of the lungs. Throughout history, pneumonia has been a leading cause of death and disability. There are many microorganisms which are involved in the development of pneumonia. Pneumonia due to bacteria is most common, however viruses and even fungi have been implicated in the development of pneumonia. Although pneumonia can strike at any age, infants and the elderly are most susceptible to severe pneumonia infections. It is estimated that over 4 million Americans suffer from pneumonia each year. Even with modern medical treatments, pneumonia remains the sixth leading cause of death in America.

Who is at risk for pneumonia?

People over the age of 65 are most at risk for developing pneumonia. Infants and small children are highly susceptible to certain bacterial and viral causes of pneumonia. If you have another lung condition, such as cystic fibrosis, asthma, or COPD, you may be at increased risk for developing a pneumonia infection. Other illnesses such as diabetes, heart disease, and HIV will increase your risk for developing pneumonia.

One of the most common risk factors for the development of pneumonia is cigarette smoking. People who smoke cigarettes are at increased risk for developing pneumonia due to the chronic irritation of the lungs caused by the smoke.

What causes pneumonia?

Pneumonia is caused by a wide range of different microorganisms. This can include bacteria, viruses, and even in some cases fungi. The specific bacteria which cause pneumonia will very based on the age, and other risk factors of the person who is infected. However, the most common bacteria which causes pneumonia in America is known as Streptococcus pneumoniae. A bacteria known as Mycoplasma is responsible for causing a type of pneumonia known as "walking pneumonia".

Viruses are responsible for up to a quarter of all cases of pneumonia. Again, there are many specific viruses which can cause pneumonia in an adult or a child. In very rare cases, pneumonia can be caused by a fungal infection. These types of pneumonia are typically not seen in people who are otherwise healthy. Fungal pneumonia is more common in people who have malfunctioning immune systems, such as what is seen in an HIV infection.

What are the symptoms of pneumonia?

Pneumonia can cause quite severe symptoms in many people. Most people will experience shortness of breath, chills, a cough, and even chest pain. A fever is seen quite commonly in pneumonia, however not in all cases. Pneumonia can often

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