Thank you all for your comments. I'm still searching for information on the benefits of raw milk as a source of beneficial bacteria to prevent/reduce the increasing problems society seems to be having with colonization by pathogenic bacteria.
An interesting link.
http://www.probiotictherapy.com.au/pages/what_are_probiotics.html
I am hearing increasingly about young people becoming ill (extremely so, to the point of death) due to an imbalance of organisms in their gut. Treatment with massive doses of "strong" antibiotics seems to be the only option at present. What about when resistances are built to these antibiotics! Wouldn't it be better to prevent this in the first place. Wouldn't it be better to use the "precautionary principle".

The chain of supply back to the source for any illness is very simple when a member of a Cow Share Program. Direct to the man who cares for our cow unlike that from the local supermarket. I've had no illness since 10/2012 and no sour milk either!

Taken from the link provided by Agronomist
http://archive.foodstandards.gov.au/_srcfiles/P1007%20PPPS%20for%20raw%20milk%201AR%20SD1%20Cow%20milk%20Risk%20Assessment.pdf
"Australian specific data on pathogen prevalence for herds and for individual animals is scarce, as is any concentration data for pathogen levels within Australian raw milk. Consequently, international data has been used for these inputs."
Do they apply here?

"Australian specific data on pathogen prevalence for herds and for individual animals is scarce, as is any concentration data for pathogen levels within Australian raw milk. Consequently, international data has been used for these inputs. In the case of herd prevalence for EHEC, the majority of data has been obtained from surveys of herds in continental Europe and North America. The two Australian studies for the prevalence of EHEC in cows had mean prevalence’s of 9.5% and 0% compared with an average of 4.6% for the international studies. The inclusion of the international studies was to maximise the uncertainty for this important model input."

The small number of Australian studies come up with values similar to that of international studies. So these values probably do apply in Australia.

When raw milk was sold door to door years ago, consumers were advised to bring milk to the boil and simmer for a time before using. That advice applied particularly to the young and any whose health was compromised.

Buyers of 'natural' foods come from a segment of the population that can be expected to be litigious.

Sellers of raw milk must be courageous.