The National Academies said the condition could involve up to 200 symptoms, make it difficult for people to work and last for months or years. The National Academies said the condition could involve up to 200 symptoms, make it difficult for people to work and last for months or years. Long Covid, Coronavirus (2019-nCoV), Coronavirus Risks and Safety Concerns, National Academies of Sciences, Engineering and Medicine, Chronic Condition (Health), your-feed-healthcare, Medicine and Health NYT > Science