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- W2012199247 abstract "A culture technique employing cold enrichment at 4 degrees C followed by selective enrichment and plating at higher temperatures (30 degrees C) was used to isolate Listeria monocytogenes from faecal samples. The samples were held at 4 degrees C for 15 weeks and cultured weekly to assess the sensitivity of the culture after cold storage for different lengths of time. No media, Listeria selective enrichment broth (LSEB), nutrient broth (NB) and saline were used as cold storage medium. Cold storage increased the frequency of Listeria positive samples. The sensitivity of the culture for Listeria spp. and L. monocytogenes was 72 and 94%, and 56 and 61% after third and seventh week of cold storage, respectively. When the results of third and seventh week of cold storage were combined, the sensitivity was 100% for Listeria spp. and 94% for L. monocytogenes. LSEB and NB as storage medium increased Listeria positive samples after the first week of cold storage but did not maintain the increase thereafter while saline had an adverse effect on the growth of the bacteria. However, samples held in no media in a pilot study involving monthly sampling of a herd revealed better results. Detection limit of the culture media was also investigated. The lowest concentration detected by culture media was 3.17 organisms/ml. This was seven organisms/g for known Listeria positive sample. The faecal samples spiked with 10-fold dilutions of L. monocytogenes and held at 4 degrees C revealed that the sample spiked with 3.17 x 10-1 cfu/ml organisms resulted in growth after the second week of cold storage. The results suggest that the culture technique employing cold enrichment followed by selective enrichment and plating is more sensitive, the storage of faecal samples in no media when compared with the samples in storage medium, LSEB, NB and saline, during cold enrichment is a better application and culture of faeces, immediately after collection, at third and seventh week of cold enrichment produce more satisfactory results." @default.
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- W2012199247 date "2002-12-01" @default.
- W2012199247 modified "2023-09-26" @default.
- W2012199247 title "Optimization of a Culture Technique for the Isolation of Listeria monocytogenes from Faecal Samples" @default.
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- W2012199247 doi "https://doi.org/10.1046/j.1439-0450.2002.00601.x" @default.
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