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What Is a Cytokine Storm?

An immune reaction gone wild may be linked with severe cases of Covid-19. Here’s what happens.

Amber Dance
Knowable Magazine
Wed, 05/06/2020 - 12:03
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This story was originally published by Knowable Magazine.

As Covid-19 cases fill the hospitals, among the sickest and most likely to die are those whose bodies react in a signature, catastrophic way. Immune cells flood and attack the lungs they should be protecting. Blood vessels leak; the blood itself clots. Blood pressure plummets, and organs start to fail.

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Such cases, doctors and scientists increasingly believe, are due to an immune system gone overboard—so that it harms instead of helps.

Normally, when the human body encounters a germ, the immune system attacks the invader and then stands down. But sometimes, that orderly army of cells wielding molecular weapons gets out of control, morphing from obedient soldiers into an unruly, torch- and pitchfork-bearing mob. Though there are tests and treatments that could help to identify and tamp down this insurrection, it’s too early to be sure of the best course of therapy for those who are suffering a storm due to Covid-19.

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