Innate immunity and why some don't get sick

How this season’s flu got supercharged — and why viruses may make you healthier.

This episode was produced by Avishay Artsy, edited by Jenny Lawton, fact-checked by Melissa Hirsch, engineered by David Tatasciore, and hosted by Jonquilyn Hill.  Photo by Elisa Schu/picture alliance via Getty Images. 

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