The proposed definition is based on 12 symptoms that most separate people with long Covid from people who didn't have the coronavirus.
But there still is no systematic, universally accepted definition of long Covid for research, and which could serve as the foundation for future tools to diagnose the condition.
More than 8,600 patients who had Covid were compared with more than 1,100 who did not have the virus. But Horwitz said the definition presented in the study is an early working one, still needs to be refined and is not yet ready for clinical use. Horwitz said the proposed definition could help create a rubric to diagnose patients with long Covid in a manner similar to Lupus. There's no single blood test that can diagnose Lupus, so physicians also rely on a collection of common symptoms to determine whether a patient has the disease.
About 17% of patients who enrolled more than 30 days after their infection during omicron developed long Covid. By contrast, about 35% of those infected before the omicron era developed long Covid.
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