What Is Booster Dose? On Monday, the Centre said that they will be considering a booster shot for everyone who is 18 and above 18, amid massive surge of Covid 19 cases in China, United Kingdom and several other South Asian countries. In case you are wondering what booster dose is, then don’t worry as we have got you covered. In this video we will be explaining what booster does is, why is it needed? What is the eligibility for a booster dose, and which vaccine will be given for the booster shot. Watch video to find out more.