This may be due to differences in pasteurization methods and temperature (46).
However, recently, low numbers of viable organisms were found
in 2.8% of 702 samples tested in commercially pasteurized milk
purchased from stores in California, Minnesota, and Wisconsin
(47). While these data have not been published in peer-reviewed
journals, these occurrences have called into question the validity
of feeding pasteurized milk products to calves as a possible
means of lowering the risk of MAP infection.