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Appl Environ Microbiol. 1972 April; 23(4): 688-692
Copyright © 1972 American Society for Microbiology. All Rights Reserved.

Efficiency of Salmonella Isolation from Meat-and-Bone Meal of One 300-g Sample Versus Ten 30-g Samples

^a Eastern Regional Research Laboratory, Philadelphia, Pennsylvania 19118^1,1

ABSTRACT

Twenty-five meat-and-bone meal samples were analyzed for salmonellae, comparing a single 300-g to ten 30-g samples. Seventeen were positive using the larger sample; eighteen were positive with the smaller. The 300-g sample showed a significantly higher (P < 0.01) percentage of confirmed salmonellae at 2 days of incubation than at 1 day. The ten 30-g samples did not show changes at 2 days. At 2 days, the 30-g samples showed significantly fewer confirmed salmonellae than the 300-g sample; however, there was no difference at 1 day. Of 1,417 presumptive colonies picked, 1,215 (85.7%) were lysine decarboxylase-positive and 1,152 (81.3%) were agglutinated by one of the somatic antisera. There were no significant differences in diversity or total numbers of different somatic groups between the large and small samples.

¹ Eastern Martketing and Nutrition Research Division, Agriculture Research Service, U.S. Department of Agriculture.