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Pasteurization also kills viruses in the milk that are passed on from the animals, and those can not be reinfected. There is ample evidence to support pasteurization of milk if you care about science.
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Really? If you care about science, then quit propagating a myth. YES, pasteurization does the things you say, but it is completely unnecessary if you keep your animals in clean living conditions and monitor their health.
There are numerous European countries that don't require the pasteurization of commercial milk products like we do in the US, and they don't have major problems with food borne illnesses from milk. Yes it happens, but it also happens with pasteurized milk.
If the OP want's to buy a pasteurizer that's his business, but he was asking for advice, and it seems like a lot of money to spend on something that is unnecessary.