Abstract
Qualitative tests for the presence of salmonellae in naturally contaminated dried milk products and tailings obtained from five plants indicated rapid decreases in numbers of positive samples. After storage of up to 10 months, <23% of the 49 product samples and <36% of the 93 tailings samples exhibited viable salmonellae. In product fractions of daily production, storage survival was greatest in the first product through the system (48.9%) when compared to an average of 23% survival in the food grade fractions. Quantitative determinations of salmonellae in nine samples indicated a significant reduction from 2.2 to 0.9 Most Probable Number per 100 g sample. These data indicated that samples which contained viable salmonellae immediately after manufacture might test negative after extended storage. However, extended storage did not free all samples of contamination. Therefore, storage cannot be based as a method of freeing contaminated dried milk products of salmonellae.
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