Category Archives: herd immunity

COVID-19 science: Understanding the basics of ‘herd immunity’ – AHA

Dr. Eduardo Sanchez is the American Heart Association’s chief medical officer for prevention and a former state health commissioner of Texas. He has dealt with major public health crises – including the SARS outbreak. In this occasional series, he’ll break down various topics related to the coronavirus pandemic.

Recently I heard a medical “expert” on the news incorrectly define the term “herd immunity.” It’s a new phrase for many people, but we’re hearing about it more and more, so it’s important to understand exactly what it is.

people cheering

Photo by David Morris on Pexels.com

First, let’s discuss how immunity works for individuals. A person can become immune (or resistant) after exposure to a disease-causing agent, such as the coronavirus causing COVID-19 in this case. The process of becoming immune includes the production of antibodies specific to the virus for future protection. Continue reading

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