Between 8 million and 23 million Americans are still sick months or years after being infected. The perplexing array of symptoms known as long Covid has left an estimated 1 million of those people so disabled they are unable to work, and those numbers are likely to grow as the virus continues to evolve and spread. Some who escaped long Covid the first time are getting it after their second or third infection.
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In one study, researchers at the University of Oxford compared brain scans of people before and after they got Covid and found that even mild cases can cause the brain to shrink by 0.2 to 2 percent more than in people who had not been infected.
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The majority of long Covid patients — more than 75 percent, according to some estimates — were never hospitalized for their original infection.