Herd immunity is an epidemiological concept that if enough people are inoculated against a disease the rest of us won’t get it. It’s been useful in holding back diseases like polio and measles, but we have vaccines for them. We don’t have one for Covid-19.
Mar 2021
The Bumpy Road to Herd Immunity
What will it take to achieve herd immunity? CNN Chief Medical Correspondent Dr. Sanjay Gupta speaks with Dr. Christopher Murray, who directs the Institute for Health Metrics and Evaluation at the University of Washington, about the role of vaccinations, variants and preventative ... Show More
13m 18s
Sep 2025
How Do Vaccines Prevent Diseases?
Our bodies can often prevent us from catching the same illness twice, and vaccines use that bodily system to prevent us from getting sick in the first place. Learn how the immune response works, what goes into vaccines, and why vaccines are safe for kids in this episode of BrainS ... Show More
13m 39s