Characterization of human invasive isolates of Listeria monocytogenes in Sweden 1986-2007.
Since 1986, 68% of the Listeria monocytogenes isolates from human cases of invasive listeriosis in Sweden are available for retrospective studies. The aim of the present study was to characterize 601 human invasive isolates of L. monocytogenes in Sweden from 1986 to 2007 by using serotyping and pulsed-field gel electrophoresis. Since 1996, serovar 4b was permanently reduced to the second or third most common serovar in human cases in Sweden. During the latter period, 2000-2007, only 13% belonged to serovar 4b and 71% to 1/2a. The dendrogram, based on pulsovars, reveals two clusters with different serovars. Cluster 1 exhibits serovars 4b and 1/2b, whereas cluster 2 consists of serovar 1/2a. Serovar 1/2a seems to be more heterogeneous than serovar 4b.
Parihar
Vishal Singh
VS
Department of Restaurant and Culinary Arts, Orebro University, Grythyttan, Sweden.
Lopez-Valladares
Gloria
G
Danielsson-Tham
Marie-Louise
ML
Peiris
Inoka
I
Helmersson
Seved
S
Unemo
Magnus
M
Andersson
Birgitta
B
Arneborn
Malin
M
Bannerman
Elizabeth
E
Barbuddhe
Sukdevo
S
Bille
Jacques
J
Hajdu
Lajos
L
Jacquet
Christine
C
Johansson
Christina
C
Löfdahl
Margareta
M
Möllerberg
Gunnel
G
Ringberg
Håkan
H
Rocourt
Jocelyne
J
Tjernberg
Ingela
I
Ursing
Jan
J
Henriques-Normark
Birgitta
B
Tham
Wilhelm
W
D016000:Cluster Analysis; D016521:Electrophoresis, Gel, Pulsed-Field; D005506:Food Contamination / Q000032:analysis; D005516:Food Microbiology; D006801:Humans; D008089:Listeria monocytogenes / Q000145:classification* / Q000472:pathogenicity*; D008088:Listeriosis / Q000382:microbiology*; D010802:Phylogeny; D012189:Retrospective Studies; D012703:Serotyping; D013548:Sweden