There are two types of immunity. Innate (non-specific) and acquired (specific). Innate is natural; you are born with these immunities. Skin and the mucous membrane are the barriers. Acquired immunity is what you are not born with. There are B Cells and T Cells. B Cells prevent pathogens from coming in. They are made from bone marrow and make antibodies that float in the blood. These antibodies fight off viruses that have stuck themselves onto host cells. T Cells are what actually fight off the pathogens. They are made in the thymus. When the immune system, recognizes a foreign cell/virus, the B Cells make tons of antibodies (proteins) that can fight it off to keep the body healthy. When a cell is infected, it puts MHC1 on the outside of it so it can inform the other cells that it has been infected. Then, perferin is injected into the cell to kill it completely so the virus cannot replicate.
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