What is herd immunity?

Health care workers answer questions about the COVID-19 vaccines.


Janice Blanchard, MD, PhD explains what herd immunity is and how COVID vaccines protects us.


Herd immunity means that a certain percentage of people have antibodies to the virus, such that they protect those who don’t have antibodies.

You can get it either by getting the COVID, which is not a great way to get antibodies—you get really sick from the disease, or you can get it from having the vaccine.

They say that you need at least 70% of the population or “herd” to have antibodies to COVID in order for it to stop transmission of the disease and protect everyone.

This information is shared for educational purposes only and should not be used as a substitute for professional medical advice. The views expressed are those of the featured medical professional and reflect information available to that professional at time of filming. Always consult a health care provider for any personal health decisions. Click here for vaccine FAQs from the CDC.

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