The concept of herd immunity is not hard to grasp. Like a phalanx of soldiers with shields all around you, you are protected by their shields if you don’t have one or have a defective one. In this case, the shields is immunity conferred by vaccines or by natural disease. Frankly, you’re better off with the vaccine. You don’t have the symptoms and complications like you would with the natural disease.
So check out this video that explains herd immunity with a visual and mathematical modeling tool:
René F. Najera, DrPH
I'm a Doctor of Public Health, having studied at the Johns Hopkins University Bloomberg School of Public Health.
All opinions are my own and in no way represent anyone else or any of the organizations for which I work.
About History of Vaccines: I am the editor of the History of Vaccines site, a project of the College of Physicians of Philadelphia. Please read the About page on the site for more information.
About Epidemiological: I am the sole contributor to Epidemiological, my personal blog to discuss all sorts of issues. It also has an About page you should check out.