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© Research
Publication : International journal of food microbiology

Characterization of Listeria strains isolated from soft cheese

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in International journal of food microbiology - 01 Apr 1993

Danielsson-Tham ML, Bille J, Brosch R, Buchrieser C, Persson K, Rocourt J, Schwarzkopf A, Tham W, Ursing J

Link to Pubmed [PMID] – 8494682

Int. J. Food Microbiol. 1993 Apr;18(2):161-6

Three soft cheeses were exposed to quantitative analysis for listeria and found to contain a large number of listeria. Thirty-five of the listeria strains isolated from the three cheeses were characterized by use of biochemical tests, serotyping, phagetyping and DNA restriction enzyme analysis. Seven isolates were identified as Listeria innocua and 28 as Listeria monocytogenes. Two to four different clones of L. monocytogenes could be identified from each cheese. In contrast, only one clone could be detected among the L. innocua isolates. From an epidemiological point of view the findings of different clones of L. monocytogenes in the same cheese emphasize the need for typing several listeria isolates from one and the same food sample. It is concluded that the best overview of the population of the listeria strains is obtained after direct plating of the sample followed by enumeration, isolation and extensive typing.

http://www.ncbi.nlm.nih.gov/pubmed/8494682