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Appl Environ Microbiol. 1971 August; 22(2): 220-223
Copyright © 1971 American Society for Microbiology. All Rights Reserved.

Isolation of Psychrophilic Bacteriophage-Host Systems from Refrigerated Food Products 1

P. A. Whitman2 and R. T. Marshall

Department of Food Science and Nutrition, University of Missouri, Columbia, Missouri 65201

ABSTRACT

Thirty-eight bacteriophage-host systems were isolated from 22 of 45 refrigerated food products examined under psychrophilic conditions. Isolates were obtained from ground beef, pork sausage, chicken, raw skim milk, and oysters, whereas no isolations were made from liquid egg whites and processed meat products. Thirty of the 38 psychrophilic bacterial hosts were gram-negative rods, and 27 of these were classified within the genus Pseudomonas; three were members of the family Enterobacteriaceae. The remaining eight were gram-positive cocci, which were tentatively classified as Leuconostoc. Plate counts of psychrophilic bacteria were greater than 2.2 x 105/ml (g) in all but one sample which contained phage, whereas phage titers ranged from less than 100 to 6.3 x 106 plaque-forming units/ml (g). Phage isolates showed limited host ranges usually attacking only those hosts upon which they were isolated. Of eight phages tested against 13 cultures of known identity, one showed lytic action, and this was against strains of P. fragi.

FOOTNOTES

2 Present address: General Foods Corp., Battle Creek, Mich.

1 Contribution from the Missouri Agricultural Experiment Station. Journal series no. 7081.

Appl Environ Microbiol. 1971 August; 22(2): 220-223
Copyright © 1971 American Society for Microbiology. All Rights Reserved.





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