A Quick Illustration Of How Herd Immunity Works (I.e. Why You Should Get Vaccinated)

The trouble with people who refuse to get vaccinated isn't so much that they're at a higher risk of getting sick, it's that they put the rest of the population, particularly the immuno-compromised, at greater risk. 

This concept, known as "herd immunity," is succinctly illustrated by this GIF, which shows why even just 75% of the population getting vaccinated is far, far better than 50%: 

[Via Reddit]