A recent Keck School of Medicine of USC study has provided new information about why some COVID-19 patients experience a mild illness at first, but then develop potentially fatal inflammation throughout the body a week or so after infection.

The findings, published in Nature Cell Biology, identify routes that the virus takes to invade immune cells — causing overreactive immune responses such as cytokine storms. These responses result in immune cells attacking organs throughout the body, but a new drug may prevent such complications.

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