Antibodies aremade by the body's natural defense system (immune system) to fight foreign substances, such as bacteria. attach themselves to the foreign substance, allowing other immune system cells to attack and destroy the substance.
The surfaces of viruses, fungi, and bacteria contain markers called. To destroy the viruses, fungi, or bacteria, the creates that are specific for each .
- The first time a person is exposed to a type of bacteria, fungus, or , the makes to that specific organism.
- Some of these remain in the after they have attacked and destroyed the bacteria, fungus, or .
- If a person is exposed to the bacteria, fungus, or again, the will "remember" the first exposure. It will quickly reactivate its and destroy the organism again.
- These often protect a person from becoming ill when exposed to the bacteria, fungus, or again. This is called .
Blood tests can detectto certain bacteria, fungi, and viruses, such as the viruses that cause , HIV infection, , and . Some conditions can be diagnosed by detecting in a person's blood to the , , or bacteria that is causing the condition.
Sometimes the body responds to its own tissue as though the tissue was a foreign substance, creatingagainst the tissue and triggering reactions that cause normal cells to be destroyed. This is called an autoimmune response or autoimmune disease.
Current as of:
October 9, 2017
E. Gregory Thompson, MD - Internal Medicine & Adam Husney, MD - Family Medicine & Martin J. Gabica, MD - Family Medicine