Herd immunity is an epidemiological concept that if enough people are inoculated against a disease the rest of us won’t get it. It’s been useful in holding back diseases like polio and measles, but we have vaccines for them. We don’t have one for Covid-19.
# Stuff You Should Know: Herd Immunity
Josh and Chuck dive deep into the concept of herd immunity—what it is, how it works, and why it matters now more than ever. They explore the fascinating history of how humans accidentally stumbled onto natural herd immunity through disease exposure, then developed vaccines to achieve it safely without widespread illness. The episode breaks down the math, explains why vaccination rates matter for everyone (even those who can't be vaccinated), and tackles the real-world challenges of vaccine hesitancy, including financial barriers and misinformation. They also examine what's happening right now with COVID-19 and why different countries are taking wildly different approaches—from elimination strategies to pursuing herd immunity the old-fashioned way, with Sweden serving as a complicated case study.
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