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Polio is a human disease, it is not zoonotic.
Strait from a healthy udder from a healthy animal is healthy.
Our animals are monitored and handled daily. If anything is amiss, you're going to see it. You can also send blood samples for testing for the important things-brucellosis, tuberculosis, John's, etc. Small, naturally raised, hands on production is the way to go. How do you know your chicken eggs are safe to eat?? Have they been sterilized first? Run through a bath? Bleach? No? Why not? B/c you know your chickens and you know they are healthy. It's not so different to produce your own milk.
Pasteurization was brought into being to kill ALL bacteria (good and bad) to prevent the milk from spoiling until it could reach it's destination. This being BEFORE the advent of reefer units to keep things cold in transit. It is no longer necessary to pasteurize everything-the thing is-pasteurization keeps the issues of sanitation and correct handling minimal for large industry. Got a cow with mastitis? Not a problem in large industry, where one cow's milk is mingled with thousands of others and pasteurized. Whereas, it would be a problem (and also noticed much more quickly) in a herd that's being hand milked and individually monitored.
What many people don't understand is to properly break down milk in the digestive system, the GOOD bacteria naturally present in milk is required. That's why many that are "lactose intolerant" can drink fresh, raw milk. That's why fresh, raw milk can be soured naturally (and produce an edible product) and storebought milk can't. The "bad" bacteria proliferate in the absence of the good and it will ruin the milk, rather than just souring.