Drinking this antibody milk can effectively inoculate a human against the corresponding disease for about 10 days. It's been well established for quiet some time. So yes, this is the origin of the milk maids during plagues that didn't get sick and had flawless skin.
Been a while since I did the research but here's a link: https://phys.org/news/2013-06-unusual-antibodies-cows-ways-therapies.html
Drinking this antibody milk can effectively inoculate a human against the corresponding disease for about 10 days. It's been well established for quiet some time. So yes, this is the origin of the milk maids during plagues that didn't get sick and had flawless skin.