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In the immune process, the messenger substance cytokine is released.
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This protein coordinates the work of immune cells.
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Cytokines activate macrophages, for example, and at the same time they dock onto the receptors of hostile cells and mark them as targets for phagocytes.
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Once the danger has been eliminated, the cytokines signal the macrophages to return to dormancy.
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In some inflammatory events, such as in Covid-19 patients, the so-called cytokine storm occurs.
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In this process, larger and larger amounts of cytokines are released uncontrollably.
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They "mark" healthy cells as well, causing immune cells to attack the body's own tissue.
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The worst case scenario would then be organ failure.