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Munich – In a viral infection, the immune system goes into full alert. Different immune cells, such as T or B cells, become active, proliferate and aggressively fight against infected cells. However, if the immune system fails to eliminate viruses, immune cells usually have very limited functions. This "depletion" of immune cells is triggered by permanent activation by viruses. This is also good for the body because strong immune responses permanently become a major burden for cells and tissues.
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