The power of herd immunity

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February 25, 2015 Today’s TED Talk Romina Libster: The power of herd immunity 14:41 minutes · TEDxRiodelaPlata 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.) Watch now » Playlist of the Day Talks to restore your faith in humanity Sometimes it’s easy to think the worst of human beings. But these inspiring talks can help you remember: altruism, kindness and helping hands are all around. Watch » 12 talks · Total run time 3:06:54 Become a Fan on Facebook Follow us @TEDTalks Read more at ideas.ted.com  Get the TED app for iPhone, iPad and Android

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