POTENTIAL MICROBIAL CONTAMINANTS FROM DAIRY EQUIPMENT WITH AUTOMATED CIRCULATION CLEANING1

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Abstract
Summary: Dairy equipment with automated circulation cleaning was studied to determine the extent and nature of the microorganisms contributing contamination to the products being processed. When automated dairy equipment was cleaned within the standards of acceptable levels of sanitation, the microorganisms remaining for growth and subsequent contamination of milk were relatively few but represented a heterogeneous lot. Micrococci and Gram positive sporeforming rods were most numerous and were found throughout the plant. Other Gram positive rods were quite common in the equipment handling pasteurized products. Gram negative rods account for only a small percentage of the numbers of organisms associated with the contamination of equipment.