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Fifty Years of Progress in Dairy Plant Sanitation Methods¹

Department of Microbiology and Public Health, Michigan State University, East Lansing

ABSTRACT

The first meeting of the Society of American Bacteriologists in 1899 aroused considerable interest in dairy sanitation. The following papers at that meeting focused attention on the need for dairy plant sanitation programs: "Certain Practical Applications of Bacteriology to Dairying" by Conn, "The Importance of Bacterial Tests in the Sanitary Supervision of Municipal Milk Supplies" by Leighton, "On the Commercial Value of Bacteriological Analysis of Milk Supplies" by Keith, "Is It Practicable for Health Departments to Prevent the Sale of Milk Containing Excessive Numbers of Bacteria?" by Park, and "A Bacteriological Examination of the Boston Milk Supply" by Sedgwick.

Early Dairy Operations

Fifty years ago dairy plant sanitation amounted to little more than kitchen cleanliness. Even this was difficult to attain as cleaners were inefficient and processing equipment was not of sanitary construction. Almost every phase of plant activity contributed some contamination. The conical cooler used to cool and aerate the milk was not easy to clean.

¹ Journal Article No. 1909, Michigan Agricultural Experiment Station.