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Please use this identifier to cite or link to this item:
http://hdl.handle.net/2282/267
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| Title: | Longitudinal studies on Listeria monocytogenes and other Listeria species in two salmon processing plants |
| Authors: | Klæboe, Halvdan
Rosef, Olav
Sæbø, Mona |
| Issue Date: | 2005 |
| Publishers version: | http://dx.doi.org/10.1080/09603120400012843 |
| Abstract: | Two plants processing salmon fillets and cold smoked salmon were investigated for occurrence of
Listeria in products and the environment. Analyses were conducted for a period of 31 weeks. At plant A,
252 samples were examined of which 97 were from unprocessed fish and 155 from cold-smoked fish. At
plant B, 189 samples of unprocessed fish were investigated. The first examination of unprocessed fish at
plant A showed a presence of L. monocytogenes and L. spp. in 81% and 19% of the samples respectively.
For cold-smoked fish the figures were 43% and 23%. At plant B, L. monocytogenes was isolated in 63% of
the samples. During the test period, management at the processing plant initiated various hygiene
precautions to improve the sanitary situation. The last batch of analyses of unprocessed fish at plant A
showed a presence of L. monocytogenes and L. spp. in 42% and. 33% of the samples respectively. For
cold-smoked fish, the figures were 6% and 11%. The isolation figures at plant B for L. monocytogenes and
L. spp. were 50% and 17% respectively. The hygienic precautions did not have a significant effect on the
presence of L. monocytogenes and L. spp. We suggest that Listeria bacteria are a part of the resident flora
and are not eliminated by current cleaning and sanitation programmes. Cold-smoking, however, gave a
significant reduction in the isolation of L. monocytogenes (P= 0.0082), while the isolation of L. spp. did
not decrease after this process. |
| Keywords: | Salmon
Listeria
Processing plants
Hygienic aspects |
| Publisher: | Taylor & Francis |
| Document type: | Journal article |
| URI: | http://hdl.handle.net/2282/267 |
| Appears in Collections: | Institutt for natur-, helse- og miljøvernfag
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