Rochester, Minnesota - The concept of herd immunity, or community immunity, has sparked debate about whether it would control the spread of COVID-19.

According to the Centers for Disease Control and Prevention (CDC), herd immunity is a situation in which sufficient proportions of a population are immune to an infectious disease to make its spread from person to person unlikely.

Dr. Gregory Poland, a Mayo Clinic infectious diseases expert and director of the Vaccine Research Group, explains the idea behind herd immunity.

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