Abstract：
AIMS:As part of a field-based study of the distribution and persistence of Salmonella infection on commercial egg-laying farms, sampling was carried out on one or more occasions in egg-packing areas of 12 farms infected with Salm. Enteritidis. METHODS AND RESULTS:Salmonellas were isolated by cultural methods. Contamination was common, with Salmonella being found in 23.1% of floor swab samples, 30.8% of grading tables, 23.1% of conveyor belts or rollers and 23.8% of candlers. Four farms were sampled after cleaning and disinfection of packing plants had been carried out on the previous day, and residual contamination was found on 6.9% of samples from grading tables, 16.0% holding/sorting tables, 12.6% of conveyors or rollers, 16.7% of vacuum egg lifters, 21.4% of floor surfaces and 5.0% of egg store floor surfaces. Sterilized eggs passed through five farm packing plants showed a contamination rate of at least 16/5,948 (0.3%) egg passages. CONCLUSIONS:It is apparent that contamination in egg-packing plants may be a significant contributory factor to external contamination of shell eggs, and improved methods of cleaning and disinfecting egg-handling equipment are required. SIGNIFICANCE AND IMPACT OF THE STUDY:The presence of Salmonella contamination in egg-packing plants presents a contamination hazard for eggs from Salmonella-free flocks. Samples from equipment in the packing plant could also be used for screening for detection of Salmonella in the throughout of the plant.
journal_name
J Appl Microbioljournal_title
Journal of applied microbiologyauthors
Davies RH,Breslin Mdoi
10.1046/j.1365-2672.2003.01817.xsubject
Has Abstractpub_date
2003-01-01 00:00:00pages
191-6issue
2eissn
1364-5072issn
1365-2672pii
1817journal_volume
94pub_type
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