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An illness can be caused by pathogens -- bacteria and viruses that cause disease. These foreign invaders can enter the body in different ways, such as through an open wound, by inhalation, or through contact with mucus membranes of the eyes, nose, or mouth.

If your body becomes infected by a pathogen, the white blood cells circulating in the blood go through a trial-and-error period to determine the best way to kill the organisms. During this ... more