A new study suggests coronavirus symptoms felt in the first week of infection may be a predictor of how long they will last.

Patients with COVID-19 who felt more than five symptoms in their first week of illness were more likely to become a so-called "COVID long hauler," which researchers qualified as having symptoms for longer than 28 days, according to the study published Wednesday in the peer-reviewed journal Nature Medicine.

The five symptoms experienced during the first week that were most predictive of becoming a long hauler were fatigue, headache, hoarse voice, muscle pain and difficulty breathing.

Researchers from King’s College London, Massachusetts General Hospital and Boston Children’s Hospital asked COVID-19 patients from the U.K., U.S. and Sweden to report their symptoms through a smartphone application from March to September 2020.

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