Pfizer says you'll need a 3rd shot within a year of getting the other two. Good business for Pfizer, making up for all that lost revenue when viagra went limp, and other companies were allowed to make a generic.
https://www.foxnews.com/health/pfizer-covid-19-vaccine-booster-bourla
https://www.foxnews.com/health/pfizer-covid-19-vaccine-booster-bourla