Booster and covid

[Thirstquenching]

Hi does anyone know why you have to wait a month between being covid positive and getting your booster?

This is firstly to ensure you are not still infectious, and to give people time to fully recover before getting the jab
inews.co.uk/news/covid-how-long-can-get-booster-jab-when-book-third-vaccine-positive-test-explained-1337718

Also so you can separate side effects from effects from your illness I believe.