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flag COVID-19 can cause lasting smell loss, even without initial symptoms, affecting most patients two years later.

flag A large NIH-led study of 3,535 adults found that COVID-19 can cause long-term smell impairment, even in people who didn’t notice issues initially. flag Two years after infection, 80% of those who reported smell changes scored poorly on a standard smell test, with 23% severely affected or unable to smell. flag Shockingly, 66% of those with no reported symptoms also had abnormal test results. flag The study, the largest using objective testing, shows hyposmia can persist unnoticed, affecting quality of life, safety, and mental health, and may signal early neurological decline. flag Experts urge routine smell screening in post-COVID care and are testing treatments like olfactory training and vitamin A, though taste loss wasn’t assessed.

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