Answering a question from Elizabeth Williams of the Atlanta Dream, Geeta Swamy, MD, an ob-gyn at Duke University, noted that "there is a chance of a booster [shot]" being necessary at some point, even if you've received both doses of Moderna or Pfizer, due to the prevalence of variants. (Pfizer's CEO has already noted that a booster shot within 12 months will likely be necessary.) Because of this, she recommended holding on to your vaccination card and not laminating or permanently altering it, as you might need to add a line or two down the road.