what happens when the human body is invaded with infections?
This is a very broad question and the lack of information does not help us to give you a specific answer that could prove to be useful to the average reader. It depends on whether the infection is localized or systemic. It also depends on whether the infection is caused by a virus, bacteria, fungus, protozoa or other parasites. The body initiates the appropriate immune response (of which there is many) in an attempt to fight off the infection. This can be effective in the short term or only minimally helpful. One way or the other the infection is initially resolved or at least slowed. Inflammation arises at the site and in systemic infections this can be widespread and cause multi-system disruptions. You should speak to a doctor about your specific infection relating to your health so that you can get a more precise answer. This article may prove useful – http://www.healthhype.com/infection-definition-causes-transmission-symptoms-signs.html