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Occurrence of Listeria monocytogenes in vegetables.

Author(s) : PORTO E., UBOLDI-EIROA M. N.

Type of article: Article

Summary

In this Brazilian study, the occurrence of L. monocytogenes in lettuce, cabbage, parsley, and watercress was investigated at various times during the year. Quantification of L. monocytogenes was carried out only in lettuce. The vegetables were purchased in the local markets in the cities of Campinas and Piracicaba in the state of Sao Paulo, Brazil. The incidence of the bacterium was determined with enrichment in Listeria enrichment broth, and incubation at 4 °C for 30 days, followed by isolation on Palcam and Oxford agars. For the L. monocytogenes count in lettuce, the multiple tube technique in tryptic soy broth with 0.6% added yeast extract was used, in addition to incubation at 4 °C for 30 days and isolation on Palcam and Oxford agars. The total incidence of L. monocytogenes in the vegetables examined was 3.2%. The average population of L. monocytogenes in lettuce was 1.2 MPN/g. Isolation of the organism occurred in the months of January (62.5%), June (12.5%) and July (25%), the wettest and coldest months of the year.

Details

  • Original title: Occurrence of Listeria monocytogenes in vegetables.
  • Record ID : 2001-2786
  • Languages: English
  • Source: Dairy Food environ. Sanit. - vol. 21 - n. 4
  • Publication date: 2001/04
  • Document available for consultation in the library of the IIR headquarters only.

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