It is made up of different organs, cells, and proteins that work together. However, the impact of these immune system changes on the health of animals is less clear, and the effect of similar deficiencies on the human … The immune system protects your child's body from outside invaders, such as bacteria, viruses, fungi, and toxins (chemicals produced by microbes). Immune System Function . To understand how vaccines work, it helps to first look at how the body fights illness. An autoimmune disease is a condition in which your immune system attacks your body. But vitamin D also helps boost your immune system. Low Vitamin D. You may know you need it for strong bones and healthy blood cells. The immune system uses several tools to fight infection. There is some evidence that various micronutrient deficiencies — for example, deficiencies of zinc, selenium, iron, copper, folic acid, and vitamins A, B6, C, and E — alter immune responses in animals, as measured in the test tube. Other scientists point out that the human immune system is trained to target pathogens that "look" a certain way, Slifka said. The Immune System—The Body’s Defense Against Infection. Common autoimmune diseases include type 1 diabetes, … The long-standing dogma that stroke is exclusively a vascular disease has been questioned by extensive clinical findings of immune factors that are associated mostly with inflammation after stroke. Antibiotics can have adverse effects on your immune system The immune system is your body's defense against invasive bacteria, viruses, and other harmful pathogens. By influencing and interacting with immune system cells, cytokines are able to regulate the body’s response to disease and infection. This invasion, called an infection, is what causes illness. The function of this system is to prevent or reduce the occurrence of infection. Immune system definition is - the bodily system that protects the body from foreign substances, cells, and tissues by producing the immune response and that includes especially the thymus, spleen, lymph nodes, special deposits of lymphoid tissue (as in the gastrointestinal tract and bone marrow), macrophages, lymphocytes including the B cells and T cells, and antibodies. The immune system is the body's natural defense mechanism. There's a mantra in organized sports that says, defense is king! In today's world, with germs lurking around every corner, it pays to have a strong defense. The immune system is a complex system of blood cells and organs, and it protects the body from harmful germs that can cause illness. This infection-fighting work happens on a cellular level: White blood cells (leukocytes) fight infections, B cells make antibodies to fight bacteria, and T cells destroy infected cells. When germs, such as bacteria or viruses, invade the body, they attack and multiply. 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