"OK, sister bees, now remember: this season we'll be feeding the hu-man's child, so wipe your feet before entering the hive, and if you feel the sniffles coming on, Don't Make Honey!"
It's more about the below minimum wage people harvesting, bottling for transport, transporting, then bottling for sale than the bees themselves. More intermediate steps to introduce contamination and more potentially contaminated sources all mixed together.