![NutritionFacts.org Video Podcast show](https://d3dthqtvwic6y7.cloudfront.net/podcast-covers/000/072/375/small/nutritionfacts-org-video-podcast.jpg)
Summary: The majority of U.S. dairy herds are infected with a cancer-causing virus, but until recently, human testing for exposure was not sufficiently sensitive.
Summary: The majority of U.S. dairy herds are infected with a cancer-causing virus, but until recently, human testing for exposure was not sufficiently sensitive.