Last updated on: 7/10/2013 | Author:

1917 – Mandatory Pasteurization of Milk Begins

“By 1917, pasteurization of all milk except that from cows proven to be free of tuberculosis was either required or officially encouraged in 46 of the country’s 52 largest cities. The proportion of milk pasteurized in these cities ranged from 10 percent to 97 percent; in most it was well over 50 percent.”