Why do some vaccines require boosters?

Dr Harish Madhava

Editorial Board

April 5th, 2018

Dr Harish Madhava

It’s not entirely clear why the length of acquired protection varies with different vaccines. A single dose of some vaccines provides lifelong immunity, while others require an additional dose (boosters) in order to maintain immunity. Boosters can be described as a ‘reminder’ to your immune system.

Read: If vaccines confer long-term protection, why do they have to be repeated?