Fubar,don't know about vaccinations, as I am all pro vaccinating. Am not sure about the diseases either, may be possible though. Still, my main reason is that milk is meant for baby cows, not humans. Digesting it is very cumbersome for our system.
Plus, the way cows are treated and miled now is far from ok.....I've been told that many cows have infections on the udders due to milking, and all that goes into the milk, which is one reason why it needs to be "killed" pasteurized...so, vile stuff, IMHO.