PubMed · 6857217
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P Després. 1983. [Data processing and meat inspection].. https://pubmed.ncbi.nlm.nih.gov/6857217/
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OBJECTIVE: To evaluate the potential food safety risks constituted by recumbent cattle that are slaughtered for edible beef. DESIGN: Prospective case series. ANIMALS: Thirty cattle in recumbency that passed a routine antemortem inspection at a US federally inspected abattoir. PROCEDURE: Aerobic, bacteriologic culture of blood samples taken immediately prior to slaughter and of spleens taken during viscera inspection. Gross lesions were recorded, and samples of liver, lung, kidney, and heart were collected from each animal for routine light microscopic examination. RESULTS: Bacteremia caused by Salmonella dublin was documented in 1 cow that had arthritis. Two other cows were condemned after postmortem inspection: 1 because of pneumonia and pleuritis and the other because of vegetative endocarditis. Three carcasses were retained and later condemned because of antibiotic residues in tissues; 1 of these cows had mastitis, 1 had liver abscesses, and 1 was the cow with vegetative endocarditis. Sarcocystosis was found in 27 of 30 hearts, but other clinically important histologic lesions were observed only in liver samples. In 11 of the 30 cows, multifocal, microscopic foci of hepatitis were observed, suggesting that terminal embolic bacterial showering of the liver had occurred in these animals. Liver samples were not submitted for bacteriologic culture. CLINICAL IMPLICATIONS: Most recumbent cows slaughtered for edible beef are not contaminated by bacteria; however, the viscera from these animals may present a food safety danger. Efforts should be made to develop rapid tests to identify bacteremic animals at slaughter and to more fully evaluate terminal showering of viscera by bacteria in cattle at slaughter.
Lactic acid decontamination (LAD) was carried out in an abattoir on pork carcasses, artificially contaminated with Salmonella typhimurium in faeces suspensions. The surface contamination with S. typhimurium ranged from 1-2 log10 cfu/cm2. Before cold and hot LAD was undertaken, the inoculum was allowed to adhere to the meat surface for 20 min. Cold LAD consisted of treatment for 60 s with 2% (pH 2.3) or 5% (pH 1.9) lactic acid (LA); for hot LAD the exposure times were 30, 60, 90 and 120 s. The spray nozzle temperatures were 11 degrees C and 55 degrees C, and that of the treated meat surface 16-18 degrees C and 36-38 degrees C, respectively. Treatment with cold 2% and 5% LA for 60 s eliminated S. typhimurium from pork carcasses inoculated with ca. 1 log10 cfu/cm2, but not from those inoculated at ca. 2 log10 cfu/cm2. However, this could be achieved by hot 2% and 5% LA sprayed for 60-120 s. Also exposures of at least 30 s using these hot LA solutions eliminated S. typhimurium consistently from carcasses inoculated with ca. 1 log10 cfu/cm2. Rinsing-off contributed only marginally to contamination reduction. Application of 2% or 5% LA for 120 s led to an unacceptable deterioration of the organoleptic qualities of the meat. Addition of nicotinic and ascorbic acid as colour stabilizers to the spraying solutions reduced these changes to just acceptable levels when 2% LA was used.
A smoked salmon processing plant including a smokehouse and a slaughterhouse was examined for the occurrence of Listeria monocytogenes and other Listeria spp. From a total of 475 samples the overall frequency of L. monocytogenes was 16%, while other Listeria spp. were found in 22% of the samples. L. monocytogenes was most often detected in samples from the smokehouse, where 29% of the environmental and 26% of the fish samples during processing contained the bacteria. 17% of the fish raw material to the smokehouse were contaminated, while 11% of the samples from vacuum-packed smoked salmon were positive for L. monocytogenes. The slaughterhouse was sporadically contaminated, but L. monocytogenes was not found in 50 samples of slaughtered fish. L. monocytogenes was found in the seawater outside the slaughterhouse. Multilocus enzyme electrophoresis divided the isolated L. monocytogenes strains into 11 electrophoretic types (ETs). One ET, ET-6, which is the most common ET in Norway, seemed to have colonized the smokehouse. Isolates from the seawater, from the slaughterhouse and from fish coming into the smokehouse, before filleting, were other ETs.