Page History

...

Genetic characteristics: den Bakker et al. and Miller et al. suggested that serovar Mississippi was likely to be polyphyletic. Cheng et al. phylogenetic analysis of 364 S. Mississippi isolates from Australia, the UK, and US revealed geographic clustering, with U.S. (subclade Ai) and Australian (subclade Aii) isolates forming distinct groups within clade A, while clade B predominated in the UK. Genetic divergence within clades was driven by mobile elements carrying virulence factors: clade A variations arose from prophage differences (i.e., Entero_mEp460, Gifsy-2, Salmon_118970_sal3, and Salmon_vB_SosS_Oslo), whereas clade B diversity stemmed from acquisition of a 47.1-kb integrative conjugative element (ICE). Miller et al. also found that, for serovar Mississippi isolates, genes encoding S-CDT (Salmonella cytolethal distending toxins) are clade associated. Ford et al. analyzed a total of 62 serovar Mississippi isolates from Australia and no antimicrobial resistance genes were detected in these isolates, except for a single human isolate from Tasmania carrying bla_TEM-1, which confers ampicillin resistance.

Animal reservoir: Unknown, but according to the metadata from NCBI PD, serovar Mississippi was isolated from wild animals such as turtles, and birds (Porphyrio hochstetteri). 

...

1. https://journals.sagepub.com/doi/abs/10.3181/00379727-54-14395
2. https://pmc.ncbi.nlm.nih.gov/articles/PMC8550085/
3. https://journals.asm.org/doi/10.1128/aac.02012-17
4. https://wwwnc.cdc.gov/eid/article/25/9/18-1811_article
5. https://www.cambridge.org/core/journals/epidemiology-and-infection/article/salmonella-mississippi-infections-in-tasmania-the-role-of-native-australian-animals-and-untreated-drinking-water/195BDF776A0BCE5D88A798AB59C0D4F1
6. https://pmc.ncbi.nlm.nih.gov/articles/PMC7168582/
7. https://www.sciencedirect.com/science/article/pii/S2214442022002091
8. https://bmcgenomics.biomedcentral.com/articles/10.1186/1471-2164-12-425
9. https://pubmed.ncbi.nlm.nih.gov/27999166/
10. https://pmc.ncbi.nlm.nih.gov/articles/PMC8550085/
11. https://pmc.ncbi.nlm.nih.gov/articles/PMC6711244/
12. https://www.foodsafetynews.com/2022/08/fda-reports-new-outbreak-of-salmonella-infections-source-of-pathogen-unknown/