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Distribution of Pseudomonas Fragi^*

Kentucky Agr. Exp. Sta.
Iowa Agr. Exp. Sta.

ABSTRACT

Pseudomonas fragi was found in 16.5 per cent of 176 lots of milk delivered by 14 producers to an Iowa milk plant. It was not detected in 17 lots delivered in June to a Kentucky milk plant but was found in 40.0 per cent of 40 deliveries in December to the same plant. Samples of defective dairy products, especially those criticized as rancid or as having a May apple odor, commonly yielded the organism.

In general, dairy plant equipment was relatively free of the organism.

An appreciable percentage (9.7 per cent) of the Iowa dairy plant water supplies yielded the organism.

In Iowa a large proportion (51.8 per cent) of samples of dirt and other materials or equipment likely to come in contact with or be contaminated by dirt was found to harbor Ps. Fragi. In Kentucky relatively few (4.1 per cent) similar samples obtained in summer yielded it, but it was found in a considerable proportion (37.4 per cent) of the samples obtained in December.

Ps. Fragi was found in 25 (71.4 per cent) of 35 samples of barnyard soil obtained from various states. It was present in a larger percentage of samples from the eastern states (90.9 per cent) than from the western states (38.5 per cent).

The wide distribution of Ps. Fragi on farms emphasizes the importance of farms as a source of the organism.

^* Journal paper of the Kentucky Agricultural Experiment Station, published by permission of Thomas P. Cooper, Director of the Kentucky Agricultural Experiment Station, and Journal Paper J-783 of the Iowa Agricultural Experiment Station, Ames, Iowa, Project 119. The studies in Iowa were financed in part through a grant from the Iowa State Brand Creameries, Inc., of Mason City, Iowa.