DNA Probes - Most organisms have immune systems that act as natural defenses against infection from viruses, bacteria and parasites.

Whenever an Organism is infected, its immune system is stimulated to produce proteins known as antibodies that recognize and assist in the destruction of disease agents carried on the surfaces of invading pests.

Utilizing this principle, scientists, employing cell fusion, have been able to clone cells that produce single specific antibodies (monoclonal antibodies) which recognize disease agents associated with specific pests.