A blood test for long Covid is possible, new research suggests Scientists can now show key differences in the blood of those who recover from Covid — and those who don't. NBC News

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Scientists have found clear differences in the blood of people with long Covid — a key first step in the development of a test to diagnose the illness.

The findings, published Monday in the journal Nature, also offer clues into what could be causing the elusive condition that has perplexed doctors worldwide and left millions with ongoing fatigue, trouble with memory and other debilitating symptoms.

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