Exaggerated immune reaction to an infection with symptoms of fever, swelling, extreme fatigue, redness, nausea. . , caused by the interaction of immune system cells that excessively increases cytokines and macrophages in some organs such as dangerously inflamed lungs. This is what seems to have happened in the so-called Spanish flu of 1918, in the 2003 SARS epidemic, H5N1 bird flu and it seems that is what is happening now with the coronavirus.
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