Covid vaccination may reduce the risk of long Covid.
https://www.bmj.com/content/383/bmj.p2633
Those who received one or more covid-19 vaccines before acute infection were 58% less likely to develop post-covid-19 condition than unvaccinated individuals (0.4% v 1.4%; adjusted hazard ratio 0.42, 95% confidence interval 0.38 to 0.46). Further analysis showed a dose-response relation: the first dose reduced the risk of post-covid-19 condition by 21% (adjusted hazard ratio 0.79, 0.68 to 0.91), two doses by 59% (0.41, 0.37 to 0.45), and three or more doses by 73% (0.27, 0.23 to 0.32).
https://www.bmj.com/content/383/bmj.p2633