• Skip to primary navigation
  • Skip to main content
  • Skip to primary sidebar

Eat My Science!

Evidence-Based Nutrition for Moms

  • Eating Healthy
    • Eat For Energy
    • Science Bits
  • What’s In Your Food
  • Kitchen Basics
    • Food Hacks
    • Kitchen Gadgets
    • Recipes
  • About

Herd Immunity – What Is It and Who Cares?

by Jadie Aranda 1 Comment

Why are we arguing about herd immunity anyway? If you understand what it is, it's not really the issue.
Why are we arguing about herd immunity anyway?

Most of us have never heard of herd immunity – it’s likely you searched the term because you saw it on the news or in a thread debating vaccinations.

People on the “vaccinate or die” side of the argument use herd immunity – also called community immunity – as a reason to push higher vaccination rates. The more people who are vaccinated, the more protected unvaccinated individuals are.

This argument is ironic – force more people to be vaccinated to protect the people who choose not to vaccinate?

Many in the anti-vax movement argue there is no proof herd immunity exists and the theory is wrongfully applied to vaccination programs. Let’s get this straight: the people who need protection by herd immunity are the people who discredit the merits of it, and the people shouting about it are protected by the vaccine and don’t need herd immunity. It’s enough to make your head spin.

What is Herd Immunity, Anyway?

At the scientific and epidemiological level, herd immunity is statistically sound. Let’s take Joe, a person infected with the measles.

Measles is very contagious, it has about a 90% infectious rate. This means if no one has immunity, 9 of the 10 people Joe has contact with will come down with the measles.

Then for each of those 9 people, they infect 9 out of 10 more people. It is easy to see why measles was such a big deal before the vaccine in the US in 1963. Before the vaccine, 3 – 4 million people in the US were infected each year.

Related:  How to Use Instant Gratification for Weight Loss
With 90% infection rate, disease spreads to 9 of 10 people who have contact.

This graphic shows Joe, infected in green, spreading his green to 9 of 10 people, then those 10 people spread it to 81/100 people.

Let’s see how this would be different if 50% of the population were immune to the measles:

Joe infects 5/10 people, those 10 infect 25/100 people.

What if 90% were immune?

Joe infects 1/10 people, those 10 infect 1/100 people.

This is the basic idea of herd immunity and why there is a push for high rates of vaccinations. For those who don’t believe herd immunity is real, isn’t 6.5 million unvaccinated children with no measles proof enough?

The Bottom Line of Herd Immunity

One case of the measles in an area where the vaccine rate is high is like a flame with no accelerant – it runs it’s course and dies out.

A community of unvaccinated individuals is like an apartment full of gas – think Fight Club. Tyler Durden can leave the gas on and fill the apartment, but it won’t ignite into a fire until there is a spark. In the same way, a community full of unvaccinated people won’t get the measles – until Joe comes to town. At a 90% infection rate, they can’t help but be consumed by the fire of the disease.

I’d rather just turn off the gas.

Please follow and like us:
Tweet

Filed Under: Science Bits, Your Amazing Body Tagged With: science, vaccines

About Jadie Aranda

Jadie Aranda is a passionate biologist who secretly teaches people science so they can live better lives. As a scientist and skeptic of all the diet misinformation fed to consumers, Jadie works tirelessly to sift through scientific studies, distill the truth, and share it with her readers in an understandable and engaging way.

In addition to publishing Eat My Science, Jadie is featured regularly in Denver Parent Magazine (denverparent.net) and you can buy her book, "Your High Energy Life: Banish Energy-Sucking Foods and Supercharge Your Days" on Amazon.

Reader Interactions

Comments

  1. Anacleto Sotomonte says

    January 24, 2022 at

    I would add that this concept also applies for NATURAL IMMUNITY. Natural immunity is the way out of this pandemic, not the leaky vaxines they made, which do not stop contracting or passing Covid19.

    So I disagree that “A community of unvaccinated individuals is like an apartment full of gas “. It is more “A community of individuals without immunity is like an apartment full of gas”. And these terapeutic jabs do not confer any immunity. Sorry.

    Reply

Leave a Reply Cancel reply

Your email address will not be published. Required fields are marked *

Recipe Rating




This site uses Akismet to reduce spam. Learn how your comment data is processed.

Primary Sidebar

Facebook
Facebook
fb-share-icon
Twitter
Visit Us
Follow Me
Tweet
Pinterest
Pinterest
fb-share-icon
INSTAGRAM

Meet Jadie

Jadie Aranda, Biologist and Author
  • Privacy Policy
  • Terms of Use
  • Contact Me

Copyright © 2025 · Wellness Pro on Genesis Framework · WordPress · Log in