Study of Salmonella Enteritidis Strains in Japan
Author Information
Author(s): Noda Tamie, Murakami Koichi, Asai Tetsuo, Etoh Yoshiki, Ishihara Tomoe, Kuroki Toshiro, Horikawa Kazumi, Fujimoto Shuji
Primary Institution: Fukuoka Institute of Health and Environmental Sciences
Hypothesis
What are the lineages of Salmonella Enteritidis before and after the pandemic during the 1980s and/or 1990s in Japan?
Conclusion
The study found that all tested Salmonella Enteritidis strains from 1973 to 2004 were characterized as a single sequence type (ST 11) with several phage types and pulsed-field profiles.
Supporting Evidence
- The study characterized all tested S. Enteritidis strains as a single ST (ST 11) and several PTs and PFPs.
- MLST analysis did not detect any nucleotide differences among the 30 S. Enteritidis strains for seven genes.
- The persistence of S. Enteritidis clonality in Japan suggests that the ST 11 lineage may have acquired a niche within chicken reproductive organs before the pandemics.
Takeaway
The researchers looked at different types of Salmonella bacteria in Japan over many years and found that they mostly belong to one family, which helps us understand how they spread.
Methodology
The study used multi-locus sequence typing (MLST) to analyze Salmonella Enteritidis strains collected from 1973 to 2004 in Japan.
Limitations
Insufficient information was available for strains isolated before the pandemic because only three isolates were tested.
Participant Demographics
The strains included 27 human strains from individual episodes, a bovine strain, a liquid egg strain, and an eggshell strain.
Digital Object Identifier (DOI)
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