Published on Jan 09, 2021

Video Transcript

[MUSIC PLAYING] JOHN WHYTE: How do vaccines offer protection against COVID-19? A population is said to reach herd immunity against a disease like COVID when enough of the population becomes immune to it, making continued spread unlikely. We can reach herd immunity by letting COVID naturally progress, but that would mean too many people getting severely ill or even dying.

A better way to reach herd immunity is with a vaccine. Vaccines train the immune system to create the same disease-fighting antibody proteins your body produces when you're infected with COVID, except you don't get sick. Scientists think that once around 70% to 80% of us are vaccinated, we'll reach herd immunity. Then everyone will be safer, and eventually, life can go back to normal.