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September 23, 2020 -- The coronavirus may damage blood marrow cells in patients with severe COVID-19, according to a new study published in the journal Science Immunology.

Previous studies have found that COVID-19 creates an “exaggerated” response from the immune system, and for some patients, this could occur in immune cells found in bone marrow, the researchers wrote.

The findings “lend support to the idea that therapeutic strategies targeting release of … cells from bone marrow should be considered in this disease,” they wrote.

The research team analyzed the immune profiles of 43 hospitalized patients during the peak of the pandemic in the United Kingdom. They found several shifts in immune signatures, particularly monocytes, which are new immune cells that are released into the bloodstream from bone marrow.

For most patients with mild COVID-19, abnormal levels shifted back to normal during their hospital stay. However, in COVID-19 patients with more severe disease, the monocytes didn’t function properly.

The researchers weren’t sure whether the monocytes were altered before they were released from the bone marrow or whether they were changed after they entered the blood, according to Reuters.

Even still, treatments that prevent the monocytes from being released could reduce the exaggerated immune response related to severe COVID-19, the news service reported.

Importantly, the immune irregularities were present before patients were admitted to intensive care, the researchers wrote, which could mean that hospitals should begin immune therapies soon after admission.

“Treating patients early after hospitalization is likely to be most beneficial, while … immune functions are disrupted,” they wrote.

Show Sources

Science Immunology, “Longitudinal immune profiling reveals key myeloid signatures associated with COVID-19.”

Reuters, “COVID-19 may damage bone marrow immune cells.”

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