So far, in the US, last I heard Pfizer requires a booster. We haven't been notified about Moderna but they might not require it. I assume that the initial studies on immunity are still tracking and will have some recommendation on what people with a previous infection should do. I would hope people follow that guidance.

Note: My last Moderna shot was in Feb, and its been radio silence and we passed the six month mark and are about to pass the eight month mark. I would hope they get done with whatever evaluation they are doing soon.