This project determined the antimicrobial activity of different levels of protamine, a natural antimicrobial, on Salmonella, E. coli and Listeria monocytogenes on meat and poultry before and after cooking.
Probiotic bacterium (Lactobacillus acidophilus; NPC 747 and NPC 750) was added to cattle feed to determine its effect on the elimination or reduction of E. coli O157:H7 in cattle. The probiotic bacterium significantly decreased the number of cattle shedding E. coli O157:H7, and had either no effect or slightly improved the feedlot performance of finishing beef steers.
Evaluation of Efficacy of a Bacteriophage System in Preventing or Modulating E. coli O157:H7 Infection of Cattle
Final report submitted on Monday, April 1, 2002
This research evaluated a specific bacteriophage treatment intended to reduce the probability of infection with E. coli and/or the amount shed if an infection was present. The bacteriophage treatment was not effective in reducing shedding of E. coli O157:H7 in calves. A “Trojan calf” model was developed which showed that all animals that come in contact with an animal shedding E. coli in a confined space will test positive.
Pediocin, a natural antimicrobial, was evaluated as a topical treatment for finished ready-to-eat products to determine if it will retard Listeria monocytogenes growth. The results indicated that the pediocin significantly reduced the number of Lm on packaged frankfurters and delayed growth of the remaining cells during storage.
This research identified optimal methods to test for the presence of Salmonella spp. on the hides, carcasses and feces of cattle.
A review of the scientific literature on the survival of pathogenic foodborne bacteria during the cooling of heat-treated, ready-to-eat meat and poultry products and the thawing of frozen raw meat and poultry products.
This study determined what were the most reliable methods for detection of Listeria spp. and Listeria monocytogenes in RTE products and if RTE meat products could be composited into analytical units greater than 25g as a means of reducing the labor and cost.
Final report submitted on Tuesday, February 1, 2000
A study conducted in 12 beef slaughtering plants validated the feasibility of testing carcasses as an alternative to testing ground beef in production and distribution channels. The incidence of E. coli O157:H7 on carcasses was reduced by the slaughter process and application of microbial intervention steps.
Final report submitted on Friday, October 1, 1999