Romina Libster: The power of herd immunity (with English subtitles) | TED
(Full English subtitles are available for this talk -- click the CC button in the bottom right of your screen to turn subtitles on.)
How do vaccines prevent disease — even among people too young to get vaccinated? It's a concept called "herd immunity," and it relies on a critical mass of people getting their shots to break the chain of infection. Health researcher Romina Libster shows how herd immunity contained a deadly outbreak of H1N1 in her hometown. (In Spanish with subtitles.)
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