Publications by authors named "Seved Helmersson"
Occurrence of genetic variants of Listeria monocytogenes strains.
Foodborne Pathog Dis
September 2013
Isolates of Listeria monocytogenes saved from outbreaks of listeriosis, cases of sporadic listeriosis, and similar events do not always belong to a solitary genetic variant. Variants of the same strain may have evolved from a unique clone, and plasmid loss or gain and phage-mediated genetic changes are suggested as the main mechanism. Some of these reports are summarized in this short communication.
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- Since 1986, 68% of Listeria monocytogenes isolates linked to human invasive listeriosis in Sweden have been studied, focusing on 601 isolates collected from 1986 to 2007.
- The study found that serovar 4b has decreased in prevalence since 1996, dropping to only 13% of cases by 2000-2007, while serovar 1/2a rose to 71%.
- Analysis identified two distinct clusters of serovars: Cluster 1 includes 4b and 1/2b, while Cluster 2 consists solely of 1/2a, which is more diverse than 4b.
Article Synopsis
- * Listeria monocytogenes, although less frequently isolated, poses a serious health risk, necessitating rapid detection and source tracing during outbreaks.
- * The study developed a new MLVA assay for L. monocytogenes using two sequenced strains and found it was generally more discriminatory than pulsed-field gel electrophoresis (PFGE) for Norwegian isolates, while PFGE was slightly better for Swedish isolates.