Here are some basics on herd immunity, and here is some more technical research if you’re interested in the details!
If you’ve ever heard my rants about vaccination, you know it’s a major topic with me. Because hey, I’m one of these immunosuppressed people this comic talks about, so it’s a bit of a sensitive subject. (“Oh, I’m sorry, you don’t like getting vaccinated? I don’t like having three month long respiratory infections because you gave me the freaking flu, but I guess you don’t care about that”)
Essentially, Ellen and her wonderful character Katherine have just said it better than I ever could—and using Shaun of the Dead references, too!!! It’s all about herd immunity—getting vaccinated isn’t just about your own health, it’s about the health—and non-zombification—of the entire human race.
This might be one of the best explanations for why we need vaccinations I’ve ever seen.