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Appl. Environ. Microbiol., Apr 1997, 1338-1343, Vol 63, No. 4
P Boerlin, F Boerlin-Petzold, E Bannerman, J Bille and T Jemmi
Seventy-two Listeria monocytogenes isolates originating from 10 different
fish products of 12 producers and 47 isolates from human listeriosis cases
were typed by serotyping and multilocus enzyme electrophoresis.
Seventy-five of these isolates were further subtyped by restriction
analysis of genomic DNA with the enzyme XhoI and by pulsed-field gel
electrophoresis using the enzymes ApaI and SmaI. The results show that
several L. monocytogenes clones identified by multilocus enzyme
electrophoresis are frequently found in fish products of different origins.
One of these clones is the same as another previously shown to be
frequently associated with meat and meat products. The epidemic-associated
electrophoretic type 1 was only rarely found in fish products. No
association was found between any type of fish product and a particular
lineage of L. monocytogenes. Both long-term persistence of a strain and
simultaneous presence of several clearly distinct strains in the products
of single producers were observed. The comparison of L. monocytogenes
isolates from human clinical listeriosis cases in Switzerland and those
from imported fish products by use of multilocus enzyme electrophoresis
showed that they do not form two clearly distinct lineages but nevertheless
belong to two separate populations. None of the 48 subtypes distinguished
by the combination of all four typing methods could be found in both
populations of human origin and those of fish origin.
Copyright © 1997, American Society for Microbiology
Typing Listeria monocytogenes isolates from fish products and human listeriosis cases
Institute of Microbiology, University Hospital, Lausanne, Switzerland. pboerlin@ovcnet.uoguelph.ca
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