During their lifetime, human beings are exposed to different microorganisms (i.e.,
virous, bacteria, fungi, and germs), parasites, and cancerous cells. This exposure endows
the immunological system with the ability to differentiate what may be accepted or rejected
by the human body, which in turn is controlled byantigens and antibodies. Antigens are any
substance that the human immune system may recognize to stimulate an immunological
response while antibodies are B-cell proteins responsible for identifying and marking
the invader agent (i.e., antigen) to be neutralized or eliminated by the immune system.
Exposure to different pathogenic agents may have two different outcomes: the exposure
may result in improving the immunological resistance, or the exposure may increase the
inflammatory response.
