The European honey bees are crucial to our food systems, but they may soon be under threat from a microscopic pest. So what exactly is this threat?

Thanks for tuning in to Seeker's #BeeWeek! To learn more about other types of bees, check out the documentary, "My Garden of a Thousand Bees," streaming now on Nature on PBS. [Please tag PBS Nature facebook.com/PBSNature ]
https://to.pbs.org/3lZRTVr

Photo credit: USDA-ARS Electron Confocal Microscopy Unit