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Numbers of Microorganisms Falling from the Air in Dairy Plants^*

Iowa State College, Ames, Iowa

ABSTRACT

The air has long been recognized as one of the sources of the microorganisms in dairy products. The data reported in the literature (e.g., 9) indicate that the numbers of organisms falling into milk from the air in stables are relatively small, especially when the air is reasonably free from dust, and it seems probable that in dairy plants comparatively few organisms fall into the various products from the air. However, under certain conditions, a small number of organisms may be of great importance. The organisms may fall into a product in which they can grow or they may fall on equipment where moisture and nutrients permit growth so that the contamination from this equipment is relatively heavy.

It is sometimes assumed that the microorganisms in the air of a dairy plant originate largely in the plant itself and in some cases attempts are made to reduce the numbers of organisms in the air by the treatment of certain rooms in a plant.

^* Journal Paper No. J 167 of the Iowa Agricultural Experiment Station, Ames, Iowa. Project No. 119.