Stroke is one of the leading causes of death and disability worldwide. 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. An autoimmune disease is a condition in which your immune system attacks your body. Cytokines affect both our innate and adaptive immune responses. It is made up of different organs, cells, and proteins that work together. 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. 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. But vitamin D also helps boost your immune system. These have been confirmed in pr … Having an optimal production and behavior of our … 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—The Body’s Defense Against Infection. The function of this system is to prevent or reduce the occurrence of infection. The immune system is a complex system of blood cells and organs, and it protects the body from harmful germs that can cause illness. The immune system is the body's natural defense mechanism. 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. When germs, such as bacteria or viruses, invade the body, they attack and multiply. The immune system uses several tools to fight infection. The immune system protects your child's body from outside invaders, such as bacteria, viruses, fungi, and toxins (chemicals produced by microbes). This invasion, called an infection, is what causes illness. Immune System Function . Low Vitamin D. You may know you need it for strong bones and healthy blood cells. 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. In today's world, with germs lurking around every corner, it pays to have a strong defense. There's a mantra in organized sports that says, defense is king! 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