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A woman receiving a covid-19 vaccine in Massachusetts

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Some people with long covid, in which people have long-lasting symptoms after a covid-19 infection, are reporting improvements in their health after being vaccinated against the coronavirus. The reports are based on anecdotes and a small informal survey rather than a scientific study, but the trend might offer clues to what causes the persistent symptoms.

Although for most people covid-19 is a mild or flu-like illness, some people are still ill many months after the infection.

While it is normal for people to take a long time to recover after …