Booster shots can be delayed for up to two months. A booster usually refers to a booster shot of the new coronavirus vaccine, which is required by booster regulations to be given six months (or more) after two doses of the vaccine. The purpose of the booster shot is to strengthen defenses and increase the body’s resistance to the new coronavirus and its mutated strains. If you want to delay, it is best not to delay for too long, as the body’s antibody levels are decreasing over time, and delaying for too long will reduce protection against the virus. If you need to delay for any reason, you can still get the shot, and the body’s immune response will still be able to defend against the virus after the shot.