The immune system is a system of biological structures and processes within an organism that protects against disease.
- Active Immunity- occurs when the person is exposed to a live pathogen, develops the disease, and becomes immune as a result of the primary immune response.
- Passive Immunity- is a short-term immunization by the injection of antibodies, such as gamma globulin, that are not produced by the recipient's cells.
- Antigen- A substance that when introduced into the body stimulates the production of an antibody.
- Antibody- Yshaped protein on the surface of B cells that is secreted into the blood orlymph in response to an antigenic stimulus, such as a bacterium, virus, parasite, ortransplanted organ, and that neutralizes the antigen by binding specifically to it;
Viruses can not be killed by antibiotics because viruses lack metabolic pathways. Viruses can reproduce without having their own metabolic pathways by infecting eukaryotic organisms and hijacking their metabolic pathways, which are not affected by antibiotics.
Severe combined immunodeficiency (SCID). This is an example of an immune deficiency that is present at birth. Children are in constant danger of infections from bacteria, viruses, and fungi. This disorder is sometimes called "bubble boy disease." In the 1970s, a boy had to live in a sterile environment inside a plastic bubble. Children with SCID are missing important white blood cells.
HIV/AIDS- A chronic immune system disease caused by HIV (human immunodeficiency virus) \, pain, and cough are symptoms, Antiviral medication