People vaccinated before their first case of COVID-19 are diagnosed with Long COVID almost four times less than unvaccinated people.
A single pre-infection dose of one of the original COVID-19 vaccines reduced the risk of Long COVID by 21%, two doses by 59%, and three or more doses by 73%.
Using the participants' health records, the researchers then assessed who went on to be diagnosed with Long COVID during the study's follow-up period, which ended in November 2022.
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