They have already found something weird: phages are great at sticking to mucus, but they do so ten times more efficiently if there’s breast milk around. Something in the milk helps them anchor in place. The culprits seem to be little spheres of fat, encased in proteins that resemble those in mucus. If you let a glass of milk sit in the open, the layer of fat that forms on the surface is full of these globules. They provide nutrition to a baby, but they might also give baby’s first viruses a foothold in the gut.
Sphere of fat and mucus
