Isolation of Bdellovibrios that prey on Escherichia coli O157:H7 and Salmonella species and application for removal of prey from stainless steel surfaces
被引:47
作者:
Fratamico, PM
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机构:Microbial Food Safety Research Unit, U.S. Department of Agriculture, Eastern Regional Research Center, Wyndmoor, PA 19038
Fratamico, PM
Cooke, PH
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机构:Microbial Food Safety Research Unit, U.S. Department of Agriculture, Eastern Regional Research Center, Wyndmoor, PA 19038
Cooke, PH
机构:
[1] Microbial Food Safety Research Unit, U.S. Department of Agriculture, Eastern Regional Research Center, Wyndmoor, PA 19038
Predatory bacteria of the genus Bdellovibrio that prey upon Escherichia coli O157:H7 and Salmonella species were isolated from soil and savage samples. Bdellovibrio isolates 45k (from soil) and 88e (from savage) attacked and lysed the E. coli and Salmonella strains tested, with log,, reductions ranging from 2.5 to 7.9 CFU/mL after 7h incubation, using a two-membered culture system. The predators showed activity against the bacteria within the temperature range of 19 to 37C. Bdellovibrio isolate 45k reduced a population off. coli dried on stainless steel surfaces by 3.6 log(10) CFU/cm(2) following 24h contact time and at a 10:1 predator to prey ratio and was also effective in reducing the level of biofilm cells. Bdellovibrios can potentially be utilized for removal of bacteria from surfaces of food processing equipment and possibly for controlling the growth of pathogenic and spoilage bacteria in foods.