"What is an infection?"
It is important to know how an infection of the body works. An infection colonizes on a host organism by some foreign contaminate. The infection, after attaching to the host, multiplies to attack the host and ends up harming the host organism.
The infection begins to interfere with the normal functioning of the host and can lead to a vast number of health complications, including death. One of the hey signs that your body has aninfection is inflammation. Sometimes inflammation can not be seen, you can have an infection in your lungs, and you would never physically see the inflammation.
There are two different types of infection; bacterial and viral. A viral infection is usually systemic -- this can attack more than one part of your body at the same time. A viral infection can also cause more than one part of your body to feel the effects of the infection; runny nose, cough, body aches, etc. A bacterial infection is commonly more localized -- you would experience swelling and pain of one part of your body.
Sometimes, you may not even know you have an infection and this is an occult infection -- which means it presents no symptoms. This type of infection usually goes unnoticed and will lead to another illness or infection.
If you allow a primary infection to mutate and go untreated, then you may develop a secondary infection where the body has a harder time getting over the illness it is trying to fight.