True toll of long COVID may be double that of current estimates, research shows
Coronavirus
Mass General Brigham May 27 2026 The true toll of long COVID may be double that of current estimates and hidden from current surveillance systems that rely on capturing diagnostic codes, according to new research led by Mass General Brigham. Investigators used a novel AI algorithm to comb through medical records of nearly 460,000 patients with COVID-19 across 58 U.S. hospitals, finding approximately 1-in-6, or roughly 16%, developed long COVID. These rates, which translate to more than 18
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