How Contagious Is Pneumonia?

Interesting extract:


http://cold.emedtv.com/m/pneumonia/is-pneumonia-contagious-p2.html

How Contagious Is Pneumonia?

A person with either viral or bacterial pneumonia is contagious. However, that person's germs are more likely to cause an upper respiratory infection (such as the common cold or the flu) in another person than pneumonia.

Many of the viruses and bacteria that cause pneumonia are the same ones that cause upper respiratory infections. These germs are usually found in the mouth and nose of the infected person. They can be spread easily to another person, either through the air or by touching a contaminated surface. Most often, they enter the person's body through the mouth, nose, or eyes.

When this happens, a battle begins. The person's immune system tries to kill the germs, while the germs try to multiply. The germs also try to spread to other parts of the body, such as the lungs and blood. In most cases, however, the body prevents this, so if a person does develop symptoms, they are usually limited to where the infection entered the body (see Cold and Flu Symptoms).

Why Do Some People Get Pneumonia and Others Don't?
While the body has an advanced system for getting rid of potentially harmful substances that make their way into the lungs, it is not perfect. In some cases, so many bacteria or viruses get into the lungs that the defense systems are simply overwhelmed.

In other cases, certain diseases can make the system unable to function as well as normal. This can be from chronic diseases like diabetes or chronic obstructive pulmonary disease (COPD) or diseases that affect the immune system, such as HIV or AIDS. Other times, the particular bacteria or virus is just so potent that the body can't handle it.

With any of these situations, a person has a greater risk of developing pneumonia.

How Long Is a Person With Pneumonia Contagious?
The time that a person with pneumonia is contagious will depend on what germ is causing the infection, although scientists are not exactly sure when the contagious period starts and ends.

For certain viruses, the best guess is that a person becomes contagious about two to three days before developing symptoms. This period can last until the person no longer shows any symptoms. So in theory, a person with pneumonia is contagious for about two weeks, although they tend to be most contagious when symptoms are at their worst -- which is usually around day two to four.

What Can I Do to Limit My Chances of Getting Sick?
You can limit your chances of getting sick by practicing good prevention. This includes:

Washing your hands regularly
Keeping your hands away from your nose, mouth, and eyes
Limiting exposure to infected people
Not sharing glasses, eating utensils, or other items that are easily contaminated.