Community Immunity: Part 1 - What Are Vaccines and Why Do They Work?

Community Immunity: Part 1 - What Are Vaccines and WhyDo They Work? Highlights the power of vaccines, which have all but eliminated diseases that once sickened, crippled or killed millions of people every year, including smallpox and polio. The two current COVID-19 vaccines are more than 90% effective at protecting the recipient (9 of 10 people won’t get sick if they get both doses of the vaccine).